16401388 has 12 divisors (see below), whose sum is σ = 28971432. Its totient is φ = 8123840.

The previous prime is 16401377. The next prime is 16401391. The reversal of 16401388 is 88310461.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18733 + ... + 19588.

It is an arithmetic number, because the mean of its divisors is an integer number (2414286).

Almost surely, 2^16401388 is an apocalyptic number.

It is an amenable number.

16401388 is a deficient number, since it is larger than the sum of its proper divisors (12570044).

16401388 is a wasteful number, since it uses less digits than its factorization.

16401388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38432 (or 38430 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 16401388 is about 4049.8627137225. The cubic root of 16401388 is about 254.0739859284.

The spelling of 16401388 in words is "sixteen million, four hundred one thousand, three hundred eighty-eight".