16403904 has 112 divisors (see below), whose sum is σ = 52669440. Its totient is φ = 4965120.

The previous prime is 16403887. The next prime is 16403923. The reversal of 16403904 is 40930461.

16403904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18577 + ... + 19439.

Almost surely, 2^16403904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16403904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26334720).

16403904 is an abundant number, since it is smaller than the sum of its proper divisors (36265536).

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

16403904 is a wasteful number, since it uses less digits than its factorization.

16403904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 16403904 is about 4050.1733296243. The cubic root of 16403904 is about 254.0869770538.

The spelling of 16403904 in words is "sixteen million, four hundred three thousand, nine hundred four".