16391660 has 12 divisors (see below), whose sum is σ = 34422528. Its totient is φ = 6556656.

The previous prime is 16391659. The next prime is 16391671. The reversal of 16391660 is 6619361.

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, 409772 + ... + 409811.

It is an arithmetic number, because the mean of its divisors is an integer number (2868544).

Almost surely, 2^16391660 is an apocalyptic number.

16391660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16391660 is an abundant number, since it is smaller than the sum of its proper divisors (18030868).

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

16391660 is a wasteful number, since it uses less digits than its factorization.

16391660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819592 (or 819590 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 16391660 is about 4048.6615072145. The cubic root of 16391660 is about 254.0237438279.

The spelling of 16391660 in words is "sixteen million, three hundred ninety-one thousand, six hundred sixty".