13240404 has 18 divisors (see below), whose sum is σ = 33468890. Its totient is φ = 4413456.

The previous prime is 13240391. The next prime is 13240421. The reversal of 13240404 is 40404231.

It can be written as a sum of positive squares in only one way, i.e., 13176900 + 63504 = 3630^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 183859 + ... + 183930.

Almost surely, 2^13240404 is an apocalyptic number.

It is an amenable number.

13240404 is an abundant number, since it is smaller than the sum of its proper divisors (20228486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13240404 is a wasteful number, since it uses less digits than its factorization.

13240404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367799 (or 367794 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 13240404 is about 3638.7365939293. The cubic root of 13240404 is about 236.5740359131.

Adding to 13240404 its reverse (40404231), we get a palindrome (53644635).

The spelling of 13240404 in words is "thirteen million, two hundred forty thousand, four hundred four".