Properties of the Number 18989

Eighteen Thousand Nine Hundred Eighty-Nine

Basics

Value: 18988 → 18989 → 18990

Parity: odd

Prime: No

Previous Prime: 18979

Next Prime: 19001

Digit Sum: 35

Digital Root: 8

Palindrome: No

Factorization: 17 × 1117

Divisors: 1, 17, 1117, 18989

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101000101101

Octal: 45055

Duodecimal: ABA5

Hexadecimal: 4a2d

Square: 360582121

Square Root: 137.80058055030102

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

Number of sets of rooted connected graphs where every block is a complete graph. A35052

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

Expansion of solution of functional equation. A112805

Composite numbers whose prime factors contain no digits other than 1 and 7. A36307

Number of separable partitions of n that consist of an even number of parts. A325723

Expansion of e.g.f. exp(1 - x - exp(2·x)). A367743

a(1)=1, a(2)=3, a(3)=8; for n>=4, a(n) = 10·a(n-3) + 8 (if a(n-3) is odd) or + 9 (if a(n-3) is even). A117713

Numerator of Euler(n, 6/29). A157360

Number of different, not necessarily connected, labeled trivalent diagrams of size n. A121357

Numbers m congruent to 5 mod 6 such that for all k >= 1 the numbers (m·4^k + 1)/3 are composite. A233551