Properties of the Number 19858

Nineteen Thousand Eight Hundred Fifty-Eight

Basics

Value: 19857 → 19858 → 19859

Parity: even

Prime: No

Previous Prime: 19853

Next Prime: 19861

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 × 9929

Divisors: 1, 2, 9929, 19858

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110110010010

Octal: 46622

Duodecimal: B5AA

Hexadecimal: 4d92

Square: 394340164

Square Root: 140.91841611372163

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

Sum of n-th prime squared and n-th perfect square. A106587

Number of partitions of 3n into exactly 6 parts. A256315

Number of partitions of 6n into 6 parts. A256226

Number of partitions of n into divisors of n that are at most sqrt(n). A327642

Numbers m such that A166133(m+1) = A166133(m)² - 1. A256703

G.f.: ∏_m>0 1/(1 - x^m + 2!*x^2·m). A293294

Composite numbers whose prime factors contain no digits other than 2 and 9. A36313

Numbers n such that n and the four successive integers produce primes if substituted for·in the polynomial 5x²+5x+1. See A090562, A090563. Terms show that longer similar chains also exist. A90100

Number of partitions of 2n into exactly 6 parts. A256310

Number of partitions of 4n into at most 6 parts. A256540