Properties of the Number 858

Eight Hundred Fifty-Eight

Basics

Value: 857 → 858 → 859

Parity: even

Prime: No

Previous Prime: 857

Next Prime: 859

Digit Sum: 21

Digital Root: 3

Palindrome: Yes

Factorization: 2 × 3 × 11 × 13

Divisors: 1, 2, 3, 6, 11, 13, 22, 26, 33, 39

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101011010

Octal: 1532

Duodecimal: 5B6

Hexadecimal: 35a

Square: 736164

Square Root: 29.29163703175362

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

Average of twin prime pairs. A14574

The squarefree numbers ordered lexicographically by their prime factorization (with factors written in decreasing order). a(n) = ∏_{k in I} prime(k+1), where I is the set of indices of nonzero binary digits in n = ∑_{k in I} 2^k. A19565

Number of separable partitions of n; see Comments. A325534

Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A089864. A89408

Products of exactly four distinct primes. A46386

a(n) = n*(n+5)/2. A55998

G.f.: ∏_k>=1 (1 + x^{2·k - 1}) / (1 - x^2·k). A6950

a(n) = n*(n+1)*(n+2)/2. A27480

Giuga numbers: composite numbers n such that p divides n/p - 1 for every prime divisor p of n. A7850

Expansion of sqrt(1 - 4·x) in powers of x. A2420