Properties of the Number 1395

One Thousand Three Hundred Ninety-Five

Basics

Value: 1394 → 1395 → 1396

Parity: odd

Prime: No

Previous Prime: 1381

Next Prime: 1399

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 31

Divisors: 1, 3, 5, 9, 15, 31, 45, 93, 155, 279

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10101110011

Octal: 2563

Duodecimal: 983

Hexadecimal: 573

Square: 1946025

Square Root: 37.3496987939662

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: Yes

Taxicab Number: No

Super Prime: No

Friedman Number: Yes

Fermat Number: No

Cullen Number: No

OEIS Sequences

Triangular matchstick numbers: a(n) = 3·n*(n+1)/2. A45943

Number of partitions of n whose mean is a part. A237984

Triangle of Gaussian binomial coefficients (or q-binomial coefficients) [n,k] for q = 2. A22166

11-gonal (or hendecagonal) numbers: a(n) = n*(9·n-7)/2. A51682

Mian-Chowla sequence (a B₂ sequence): a(1) = 1; for n>1, a(n) = smallest number > a(n-1) such that the pairwise sums of elements are all distinct. A5282

Generalized 11-gonal (or hendecagonal) numbers: m*(9·m - 7)/2 with m = 0, 1, -1, 2, -2, 3, -3, ... A195160

Numbers that are the sum of 6 positive 5th powers. A3351

Numbers that are sums of 2 distinct positive cubes. A24670

a(n) = a(n-1) + a(floor(n/2)), a(1) = 1. A33485

Multiples of 9 containing a 9 in their decimal representation. A121029