18718972 has 24 divisors (see below), whose sum is σ = 35429184. Its totient is φ = 8620032.

The previous prime is 18718969. The next prime is 18718979. The reversal of 18718972 is 27981781.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18718979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268 + ... + 6124.

It is an arithmetic number, because the mean of its divisors is an integer number (1476216).

Almost surely, 2^18718972 is an apocalyptic number.

It is an amenable number.

18718972 is a deficient number, since it is larger than the sum of its proper divisors (16710212).

18718972 is a wasteful number, since it uses less digits than its factorization.

18718972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5925 (or 5923 counting only the distinct ones).

The product of its digits is 56448, while the sum is 43.

The square root of 18718972 is about 4326.5427306338. The cubic root of 18718972 is about 265.5180184087.

The spelling of 18718972 in words is "eighteen million, seven hundred eighteen thousand, nine hundred seventy-two".