Properties of the Number 18378

Eighteen Thousand Three Hundred Seventy-Eight

Basics

Value: 18377 → 18378 → 18379

Parity: even

Prime: No

Previous Prime: 18371

Next Prime: 18379

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 1021

Divisors: 1, 2, 3, 6, 9, 18, 1021, 2042, 3063, 6126

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011111001010

Octal: 43712

Duodecimal: A776

Hexadecimal: 47ca

Square: 337750884

Square Root: 135.56548233234005

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

T(n,k) = number of arrays of the median of three adjacent elements of some length n+2 0..k array. A228740

Number of ways to write n as an ordered sum of 6 nonprime numbers. A341483

T(n,k)=Number of nXnXn triangular 0..k arrays with new values introduced in sequential zero-upwards order and exactly one 2x2x2 triangle having values all equal. A271075

Number of 1-sided polyrhombs with n cells. A151522

Triangle read by rows: coefficients of polynomials P_n(x) arising from RNA combinatorics. A270791

Number of 2 X n arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..2 2 X n array. A219382

Number of arrays of the median of three adjacent elements of some length -(n+2) 0..3 array. A228735

Number of nX5 0..1 arrays with every element unequal to 1, 2, 5, 6 or 7 king-move adjacent elements, with upper left element zero. A305179

Integers that concatenate 3 counts: the number of terms in the sequence so far, the number of primes in the sequence so far, the number of digits in the sequence so far, with a(1)= 113. The sequence is always extended with the smallest available integer not leading to a contradiction or a dead end. A309617

Numbers k such that 345·2^k+1 is prime. A319742