13256405 has 4 divisors (see below), whose sum is σ = 15907692. Its totient is φ = 10605120.

The previous prime is 13256401. The next prime is 13256417. The reversal of 13256405 is 50465231.

13256405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1811716 + 11444689 = 1346^2 + 3383^2 .

It is not a de Polignac number, because 13256405 - 2² = 13256401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13256401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325636 + ... + 1325645.

It is an arithmetic number, because the mean of its divisors is an integer number (3976923).

Almost surely, 2^13256405 is an apocalyptic number.

It is an amenable number.

13256405 is a deficient number, since it is larger than the sum of its proper divisors (2651287).

13256405 is an equidigital number, since it uses as much as digits as its factorization.

13256405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651286.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 13256405 is about 3640.9346327557. The cubic root of 13256405 is about 236.6692972883.

The spelling of 13256405 in words is "thirteen million, two hundred fifty-six thousand, four hundred five".