17997916 has 12 divisors (see below), whose sum is σ = 31671640. Its totient is φ = 8948880.

The previous prime is 17997907. The next prime is 17997919. The reversal of 17997916 is 61979971.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 17997916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17997919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11706 + ... + 13153.

Almost surely, 2^17997916 is an apocalyptic number.

It is an amenable number.

17997916 is a deficient number, since it is larger than the sum of its proper divisors (13673724).

17997916 is a wasteful number, since it uses less digits than its factorization.

17997916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25044 (or 25042 counting only the distinct ones).

The product of its digits is 214326, while the sum is 49.

The square root of 17997916 is about 4242.3950782547. The cubic root of 17997916 is about 262.0640249100.

The spelling of 17997916 in words is "seventeen million, nine hundred ninety-seven thousand, nine hundred sixteen".