13256805 has 16 divisors (see below), whose sum is σ = 21369024. Its totient is φ = 7017600.

The previous prime is 13256801. The next prime is 13256819. The reversal of 13256805 is 50865231.

It is not a de Polignac number, because 13256805 - 2² = 13256801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13256801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1171 + ... + 5280.

It is an arithmetic number, because the mean of its divisors is an integer number (1335564).

Almost surely, 2^13256805 is an apocalyptic number.

13256805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13256805 is a deficient number, since it is larger than the sum of its proper divisors (8112219).

13256805 is a wasteful number, since it uses less digits than its factorization.

13256805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 13256805 is about 3640.9895632918. The cubic root of 13256805 is about 236.6716776915.

The spelling of 13256805 in words is "thirteen million, two hundred fifty-six thousand, eight hundred five".