Properties of the Number 1986

One Thousand Nine Hundred Eighty-Six

Basics

Value: 1985 → 1986 → 1987

Parity: even

Prime: No

Previous Prime: 1979

Next Prime: 1987

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 331

Divisors: 1, 2, 3, 6, 331, 662, 993, 1986

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11111000010

Octal: 3702

Duodecimal: 1196

Hexadecimal: 7c2

Square: 3944196

Square Root: 44.56455991031439

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 integer partitions of n with reverse-alternating sum >= 0. A344607

Number of integer partitions of 2n with reverse-alternating sum >= 0. A344611

Coordination sequence for "tcd" 3D uniform tiling. A299287

Partial sums of sequence of odd primes (A065091); a(n) = sum of the first n odd primes. A71148

a(n) = 2*(n² - n + 1). A51890

Number of integer partitions of n with unimodal run-lengths. A332280

Number of ways to write n as an orderless product of orderless sums. A318949

Positive integers n such that n¹⁷ + 1 is semiprime (A001358). A104494

Numbers n such that the decimal expansions of both n and n² have 1 as smallest digit and 9 as largest digit. A256601

a(n) = sum of the remainders when the n-th prime is divided by primes up to the (n-1)-th prime. A33955