13256005 has 16 divisors (see below), whose sum is σ = 19249920. Its totient is φ = 8554752.

The previous prime is 13255999. The next prime is 13256029. The reversal of 13256005 is 50065231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13256005 - 2⁹ = 13255493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10545 + ... + 11734.

It is an arithmetic number, because the mean of its divisors is an integer number (1203120).

Almost surely, 2^13256005 is an apocalyptic number.

It is an amenable number.

13256005 is a deficient number, since it is larger than the sum of its proper divisors (5993915).

13256005 is a wasteful number, since it uses less digits than its factorization.

13256005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22308.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 13256005 is about 3640.8797013909. The cubic root of 13256005 is about 236.6669168372. Note that the first 3 decimals are identical.

The spelling of 13256005 in words is "thirteen million, two hundred fifty-six thousand, five".