13640404 has 12 divisors (see below), whose sum is σ = 25127200. Its totient is φ = 6461208.

The previous prime is 13640401. The next prime is 13640437. The reversal of 13640404 is 40404631.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640401) 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, 89664 + ... + 89815.

Almost surely, 2^13640404 is an apocalyptic number.

It is an amenable number.

13640404 is a deficient number, since it is larger than the sum of its proper divisors (11486796).

13640404 is a wasteful number, since it uses less digits than its factorization.

13640404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179502 (or 179500 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 13640404 is about 3693.2917566854. The cubic root of 13640404 is about 238.9327845624.

The spelling of 13640404 in words is "thirteen million, six hundred forty thousand, four hundred four".