Properties of the Number 18880

Eighteen Thousand Eight Hundred Eighty

Basics

Value: 18879 → 18880 → 18881

Parity: even

Prime: No

Previous Prime: 18869

Next Prime: 18899

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ⁶ × 5 × 59

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100100111000000

Octal: 44700

Duodecimal: AB14

Hexadecimal: 49c0

Square: 356454400

Square Root: 137.40451229854133

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

a(n) = n*(n+2)*(2·n-1)/3. Also, row sums of triangle A131422. A131423

Composites whose prime factorization in base 3 is an anagram of the number in base 3. A260047

Numbers n such that 8·3ⁿ + 1 is prime. A5538

40-gonal numbers: a(n) = 38·n*(n-1)/2 + n. A261191

Sums of 4 distinct powers of 5. A38476

Expansion of ∏_k>=1 (1 + x^2·k) / (1 - x^k). A279328

Expansion of the e.g.f. (1 - 2·x - 2·log(1 - x) - exp(2·x)*(1 - x)²) / 4 - 1. A347210

Triangle, read by rows, such that row n equals the inverse binomial transform of column n of the triangle A034870 of coefficients in successive powers of the trinomial (1+2·x+x²), omitting leading zeros. A99605

Monotonic ordering of nonnegative differences 2ⁱ-6^j, for 40>=i>=0, j>=0. A192116

Monotonic ordering of nonnegative differences 4ⁱ-6^j, for 40>= i>=0, j>=0. A192163