16404004 has 12 divisors (see below), whose sum is σ = 28828800. Its totient is φ = 8167208.

The previous prime is 16404001. The next prime is 16404007. The reversal of 16404004 is 40040461.

16404004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16404001) and next prime (16404007).

It is not an unprimeable number, because it can be changed into a prime (16404001) 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, 7624 + ... + 9535.

It is an arithmetic number, because the mean of its divisors is an integer number (2402400).

Almost surely, 2^16404004 is an apocalyptic number.

It is an amenable number.

16404004 is a deficient number, since it is larger than the sum of its proper divisors (12424796).

16404004 is a wasteful number, since it uses less digits than its factorization.

16404004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17402 (or 17400 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 16404004 is about 4050.1856747562. The cubic root of 16404004 is about 254.0874933668.

Adding to 16404004 its reverse (40040461), we get a palindrome (56444465).

The spelling of 16404004 in words is "sixteen million, four hundred four thousand, four".