18715972 has 12 divisors (see below), whose sum is σ = 35730576. Its totient is φ = 8507240.

The previous prime is 18715927. The next prime is 18715979. The reversal of 18715972 is 27951781.

It is not an unprimeable number, because it can be changed into a prime (18715979) 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 3 ways as a sum of consecutive naturals, for example, 212638 + ... + 212725.

It is an arithmetic number, because the mean of its divisors is an integer number (2977548).

Almost surely, 2^18715972 is an apocalyptic number.

It is an amenable number.

18715972 is a deficient number, since it is larger than the sum of its proper divisors (17014604).

18715972 is a wasteful number, since it uses less digits than its factorization.

18715972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425378 (or 425376 counting only the distinct ones).

The product of its digits is 35280, while the sum is 40.

The square root of 18715972 is about 4326.1960195997. The cubic root of 18715972 is about 265.5038332171.

The spelling of 18715972 in words is "eighteen million, seven hundred fifteen thousand, nine hundred seventy-two".