13640825 has 12 divisors (see below), whose sum is σ = 18452688. Its totient is φ = 9920400.

The previous prime is 13640813. The next prime is 13640831. The reversal of 13640825 is 52804631.

It is a de Polignac number, because none of the positive numbers 2^k-13640825 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24527 + ... + 25076.

It is an arithmetic number, because the mean of its divisors is an integer number (1537724).

Almost surely, 2^13640825 is an apocalyptic number.

It is an amenable number.

13640825 is a deficient number, since it is larger than the sum of its proper divisors (4811863).

13640825 is a wasteful number, since it uses less digits than its factorization.

13640825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49624 (or 49619 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 13640825 is about 3693.3487514720. The cubic root of 13640825 is about 238.9352426926.

The spelling of 13640825 in words is "thirteen million, six hundred forty thousand, eight hundred twenty-five".