16400788 has 12 divisors (see below), whose sum is σ = 28852992. Its totient is φ = 8157080.

The previous prime is 16400737. The next prime is 16400789. The reversal of 16400788 is 88700461.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9970 + ... + 11497.

It is an arithmetic number, because the mean of its divisors is an integer number (2404416).

Almost surely, 2^16400788 is an apocalyptic number.

It is an amenable number.

16400788 is a deficient number, since it is larger than the sum of its proper divisors (12452204).

16400788 is a wasteful number, since it uses less digits than its factorization.

16400788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21662 (or 21660 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 16400788 is about 4049.7886364599. The cubic root of 16400788 is about 254.0708876896.

The spelling of 16400788 in words is "sixteen million, four hundred thousand, seven hundred eighty-eight".