17998072 has 8 divisors (see below), whose sum is σ = 33746400. Its totient is φ = 8999032.

The previous prime is 17998069. The next prime is 17998081. The reversal of 17998072 is 27089971.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1124872 + ... + 1124887.

It is an arithmetic number, because the mean of its divisors is an integer number (4218300).

Almost surely, 2^17998072 is an apocalyptic number.

It is an amenable number.

17998072 is a deficient number, since it is larger than the sum of its proper divisors (15748328).

17998072 is a wasteful number, since it uses less digits than its factorization.

17998072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249765 (or 2249761 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 17998072 is about 4242.4134640556. The cubic root of 17998072 is about 262.0647820694.

The spelling of 17998072 in words is "seventeen million, nine hundred ninety-eight thousand, seventy-two".