Properties of the Number 18999

Eighteen Thousand Nine Hundred Ninety-Nine

Basics

Value: 18998 → 18999 → 19000

Parity: odd

Prime: No

Previous Prime: 18979

Next Prime: 19001

Digit Sum: 36

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2111

Divisors: 1, 3, 9, 2111, 6333, 18999

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101000110111

Octal: 45067

Duodecimal: ABB3

Hexadecimal: 4a37

Square: 360962001

Square Root: 137.83686009192172

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 positive subset sums of strict integer partitions of n. A284640

First term of n-th difference sequence of (floor(k·r)), r = sqrt(2), k >= 0. A325664

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(0) + b(1) + ... + b(n-1), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences. A295053

Composite numbers k such that the digits of k are in nondecreasing order while the digits of the concatenation of k's ascending order prime factors, with repetition, are in nonincreasing order. A372280

Consider numbers of the form ...31975319753197531, whose digits read from the right are 1,3,5,7,9,1,3,5,7,9,1,... Sequence gives lengths of these numbers which are primes. A90743

Number of compositions of n in which the maximal multiplicity of parts equals 6. A243123

G.f. satisfies A(x) = exp( ∑_k>=1 A(x^k) * x^k/(k * (1 + x^k)³) ). A363575

Numbers k such that σ(k-3) + σ(k+3) = σ(2·k). A67129

Least integer having a larger digital sum than the previous term and such that 10^n-1 + a(n) is a prime. A199190

Numbers that set a new integer record for the ratio between the product and the sum of their digits. A240520