Properties of the Number -19761

Nineteen Thousand Seven Hundred Sixty-One

Basics

Value: -19762 → -19761 → -19760

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 941

Divisors: 1, 3, 7, 21, 941, 2823, 6587, 19761

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100110100110001

Octal: -46461

Duodecimal: -B529

Hexadecimal: -4d31

Square: 390497121

Square Root: 140.57382402140166

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

Expansion of ∏_k>=1 (1 + x^k/(1 + x)). A307602

Interprimes (A024675) which are of the form s·prime, s=21. A75296

Partial sums of sequence (essentially A002378): 1, 2, 6, 12, 20, 30, 42, 56, 72, 90, ... A64999

Numbers k such that A(k+1) = A(k) + 1, where A() = A005101() are the abundant numbers. A169822

Integers which can be written in exactly three ways as sum of two distinct nonzero pentagonal numbers. A333013

This is to A139025 as A139025 to A014688, see A139025 for details. A139026

Compound filter: a(n) = P(σ(n), σ(2n)), where P(n,k) is sequence A000027 used as a pairing function, and σ is the sum of divisors (A000203). A286359

Numbers m such that f(k) * 2^m - 1 is prime, where f(j) = A070826(j) and k is the number of decimal digits of 2^m. A95991

Number of length n binary sequences with at most 4 of every adjacent 6 bits set. A133552

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-111 pattern in any orientation. A146279