16390504 has 32 divisors (see below), whose sum is σ = 33264000. Its totient is φ = 7526592.

The previous prime is 16390489. The next prime is 16390531. The reversal of 16390504 is 40509361.

16390504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37117 + ... + 37555.

It is an arithmetic number, because the mean of its divisors is an integer number (1039500).

Almost surely, 2^16390504 is an apocalyptic number.

It is an amenable number.

16390504 is an abundant number, since it is smaller than the sum of its proper divisors (16873496).

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

16390504 is a wasteful number, since it uses less digits than its factorization.

16390504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 16390504 is about 4048.5187414658. The cubic root of 16390504 is about 254.0177721254.

Adding to 16390504 its reverse (40509361), we get a palindrome (56899865).

The spelling of 16390504 in words is "sixteen million, three hundred ninety thousand, five hundred four".