17998972 has 24 divisors (see below), whose sum is σ = 33933312. Its totient is φ = 8329200.

The previous prime is 17998963. The next prime is 17998973. The reversal of 17998972 is 27989971.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17998973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304 + ... + 6007.

It is an arithmetic number, because the mean of its divisors is an integer number (1413888).

Almost surely, 2^17998972 is an apocalyptic number.

It is an amenable number.

17998972 is a deficient number, since it is larger than the sum of its proper divisors (15934340).

17998972 is a wasteful number, since it uses less digits than its factorization.

17998972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369 (or 6367 counting only the distinct ones).

The product of its digits is 571536, while the sum is 52.

The square root of 17998972 is about 4242.5195344276. The cubic root of 17998972 is about 262.0691502108.

Subtracting 17998972 from its reverse (27989971), we obtain a palindrome (9990999).

The spelling of 17998972 in words is "seventeen million, nine hundred ninety-eight thousand, nine hundred seventy-two".