13402404 has 18 divisors (see below), whose sum is σ = 33878390. Its totient is φ = 4467456.

The previous prime is 13402373. The next prime is 13402423. The reversal of 13402404 is 40420431.

It can be written as a sum of positive squares in only one way, i.e., 12236004 + 1166400 = 3498^2 + 1080^2 .

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 an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186109 + ... + 186180.

Almost surely, 2^13402404 is an apocalyptic number.

It is an amenable number.

13402404 is an abundant number, since it is smaller than the sum of its proper divisors (20475986).

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

13402404 is a wasteful number, since it uses less digits than its factorization.

13402404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372299 (or 372294 counting only the distinct ones).

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

The square root of 13402404 is about 3660.9293901959. The cubic root of 13402404 is about 237.5349769354.

Adding to 13402404 its reverse (40420431), we get a palindrome (53822835).

The spelling of 13402404 in words is "thirteen million, four hundred two thousand, four hundred four".