Properties of the Number 18988

Eighteen Thousand Nine Hundred Eighty-Eight

Basics

Value: 18987 → 18988 → 18989

Parity: even

Prime: No

Previous Prime: 18979

Next Prime: 19001

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 47 × 101

Divisors: 1, 2, 4, 47, 94, 101, 188, 202, 404, 4747

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100101000101100

Octal: 45054

Duodecimal: ABA4

Hexadecimal: 4a2c

Square: 360544144

Square Root: 137.79695207079146

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

Numbers n such that the sum of the inverse of the exponents in the binary expansion of 2n is equal to 1. A272036

Sum of all the parts in the partitions of n into 5 squarefree parts. A308839

Numbers n such that the sum of the inverse of the exponents in the binary expansion of 2n is the inverse of an integer. A272034

Numbers n such that the sum of the inverse of the exponents in the binary expansion of 2n is an integer. A272035

a(n) = ∑_k=0..n binomial(2·n, k) * p(k), where p(k) is the partition function A000041. A356267

Decimal numbers m such that the product of the binary string of m and the binary string of m in reverse contains the binary string of m as a substring. A342130

Least k such that k·M(n)*M(n+4) + 1 is prime, where M(n) = A000668(n). A365065

Number of nX2 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors. A203340

Number of (n+1)X(n+1) -11..11 symmetric matrices with every 2X2 subblock having sum zero and one, two or three distinct values. A211714

Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ATT = AlPO4-12-TAMU [Al12P12O48].4R starting with a T2 atom. A18988