Properties of the Number 39999

Thirty-Nine Thousand Nine Hundred Ninety-Nine

Basics

Value: 39998 → 39999 → 40000

Parity: odd

Prime: No

Previous Prime: 39989

Next Prime: 40009

Digit Sum: 39

Digital Root: 3

Palindrome: No

Factorization: 3 × 67 × 199

Divisors: 1, 3, 67, 199, 201, 597, 13333, 39999

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001110000111111

Octal: 116077

Duodecimal: 1B193

Hexadecimal: 9c3f

Square: 1599920001

Square Root: 199.9974999843748

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

Smallest number whose sum of digits is n. A51885

Numbers k for which the digital sum of k contains the same distinct digits as k itself. A249515

a(n) = n·10ⁿ - 1. A64756

a(n) is the smallest m such that for any N, at least one of S(N), S(N+1), ..., S(N+m-1) is divisible by n, where S(N) is the sum of digits of N. A331788

Squarefree numbers of the form (prime(k)+1)*(prime(k+1)+1)/4. A79095

Triangle T(n,k) = 10^n-1 -1 + k·floor(9·10^n-1/(n+1)), with 1 <= r <= n, read by rows. A93850

a(n) = 64·n² - 1. A158684

Least common multiple of 5·n+1 and 5·n-1. A282285

a(n) is the smallest number m such that τ(m+1) = τ(m) + n. A343018

Numbers k such that k and k+1 are both terms in A377732. A377733