16401656 has 16 divisors (see below), whose sum is σ = 31584840. Its totient is φ = 7979040.

The previous prime is 16401641. The next prime is 16401701. The reversal of 16401656 is 65610461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27410 + ... + 28001.

Almost surely, 2^16401656 is an apocalyptic number.

It is an amenable number.

16401656 is a deficient number, since it is larger than the sum of its proper divisors (15183184).

16401656 is a wasteful number, since it uses less digits than its factorization.

16401656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55454 (or 55450 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 16401656 is about 4049.8958011287. The cubic root of 16401656 is about 254.0753697840.

The spelling of 16401656 in words is "sixteen million, four hundred one thousand, six hundred fifty-six".