Properties of the Number 1995

One Thousand Nine Hundred Ninety-Five

Basics

Value: 1994 → 1995 → 1996

Parity: odd

Prime: No

Previous Prime: 1993

Next Prime: 1997

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 7 × 19

Divisors: 1, 3, 5, 7, 15, 19, 21, 35, 57, 95

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11111001011

Octal: 3713

Duodecimal: 11A3

Hexadecimal: 7cb

Square: 3980025

Square Root: 44.66542286825459

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 sublattices of index n in generic 3-dimensional lattice. A1001

Multiples of 19 containing a 19 in their decimal representation. A121039

a(n) = 3·n*(n + 3)/2. A140091

a(n) = floor(n*(n-1)*(n-2)/4). A11886

Numbers with one fewer divisors than the sum of their prime indices. A325694

Eric Angelini's "1995" puzzle: the sequence is defined by the property that if one writes the English names for the entries, replaces each letter with its rank in the alphabet and calculates the absolute values of the differences, one recovers the sequence. A131744

Sum of all parts of all partitions of n that do not contain 1 as a part. A138880

a(n) = n*(9·n + 1)/2. A22267

Triangle read by rows: T(n,k) is the number of unlabeled simple graphs on n vertices with independence number k. A263341

Number of strict integer partitions of n containing the sum of no pair of distinct parts. A variation of sum-free strict partitions. A364533

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