Properties of the Number -1930

Nine Hundred Thirty

Basics

Value: -1931 → -1930 → -1929

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 193

Divisors: 1, 2, 5, 10, 193, 386, 965, 1930

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -11110001010

Octal: -3612

Duodecimal: -114A

Hexadecimal: -78a

Square: 3724900

Square Root: 43.93176527297759

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

a(n) = ∑_k=1..n k·floor(n/k); also ∑_k=1..n σ(k) where σ(n) = sum of divisors of n (A000203). A24916

Number of partitions of n into parts 3k and 3k+1 with at least one part of each type. A35618

Number of partitions of n that sorted in increasing order do not contain a part k in position k. A238394

Number of strict integer partitions of n whose length (number of parts) is not equal to the sum of any subset. A367215

Numbers n such that the decimal expansions of both n and n² have 0 as smallest digit and 9 as largest digit. A256709

Numbers k whose largest divisor <= sqrt(k) equals 10. A162530

Number of pairs of consecutive integers x, x+1 such that all prime factors of both·and x+1 are at most the n-th prime. A2071

Number of integer partitions of n with a unique prime part. A379304

Positive integers n such that n¹³ + 1 is semiprime. A105237

Analog of A121805, but starting with 4. A366492