Properties of the Number -1975

Nine Hundred Seventy-Five

Basics

Value: -1976 → -1975 → -1974

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 ² × 79

Divisors: 1, 5, 25, 79, 395, 1975

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11110110111

Octal: -3667

Duodecimal: -1187

Hexadecimal: -7b7

Square: 3900625

Square Root: 44.44097208657794

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

Consider the triangle in which the n-th row starts with n, contains n terms and the difference of successive terms is 1,2,3,... up to n-1. Sequence gives row sums. A81498

Inverse Euler transform of A000960. A99066

Number of partitions of n with nonnegative rank. A64174

Total number of ON states after n generations of cellular automaton based on hexagons. A151723

Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n and height k (1 <= k <= n). A80936

Expansion of ∏_m>0 (1+q^m)^m(m+1/2). A28377

Number of integer compositions of n whose leaders of strictly increasing runs are distinct. A374687

Number of partitions of n such that the successive differences of consecutive parts are strictly increasing. A240027

a(n) = (2·n-1)*(n² -n +2)/2. A63488

Numbers with exactly 9 ones in binary expansion. A23691