16991996 has 12 divisors (see below), whose sum is σ = 33984048. Its totient is φ = 7282272.

The previous prime is 16991951. The next prime is 16992007. The reversal of 16991996 is 69919961.

16991996 is an admirable number.

It is a congruent number.

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, 303401 + ... + 303456.

It is an arithmetic number, because the mean of its divisors is an integer number (2832004).

Almost surely, 2^16991996 is an apocalyptic number.

It is an amenable number.

16991996 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16991996 is a wasteful number, since it uses less digits than its factorization.

16991996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606868 (or 606866 counting only the distinct ones).

The product of its digits is 236196, while the sum is 50.

The square root of 16991996 is about 4122.1348837708. The cubic root of 16991996 is about 257.0877987352.

The spelling of 16991996 in words is "sixteen million, nine hundred ninety-one thousand, nine hundred ninety-six".