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Properties of the Number 18900

Eighteen Thousand Nine Hundred

Basics

Value: 18899 → 18900 → 18901

Parity: even

Prime: No

Previous Prime: 18899

Next Prime: 18911

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 2 × 3 3 × 5 2 × 7

Divisors: 1, 2, 3, 4, 5, 6, 7, 9, 10, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100111010100

Octal: 44724

Duodecimal: AB30

Hexadecimal: 49d4

Square: 357210000

Square Root: 137.4772708486752

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 strict partitions of 2n that include a partition of n. A237258
Floor-factorial numbers: a(n) = ∏k=1..n floor(n/k). A10786
Triangle of number of labeled rooted trees with n nodes and k leaves, n >= 1, 1 <= k <= n. A55302
Heinz numbers of supernormal integer partitions. A317246
Number of lines through at least 2 points of an n X n grid of points. A18808
Number of degree-n even permutations of order exactly 4. A51695
Completely multiplicative function with a(prime(k)) = prime(k)*prime(k+1). A191002
Suspected divisor-or-multiple permutation: a(1) = 1, and for n > 1, a(n) is either the least unitary divisor of a(n-1) not already present, or (if all unitary divisors already used), a(n) = a(n-1) * {the least power of the least prime not dividing a(n-1) such that the term is not already present}. A304531
a(n) = ∏d∣n, d<n A019565(A289813(d)); a product obtained from the 1-digits present in ternary expansions of proper divisors of n. A293221
Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=13. A135198