18959972 has 24 divisors (see below), whose sum is σ = 34594560. Its totient is φ = 9082080.

The previous prime is 18959869. The next prime is 18959977. The reversal of 18959972 is 27995981.

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 18959972.

It is not an unprimeable number, because it can be changed into a prime (18959977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12554 + ... + 13982.

It is an arithmetic number, because the mean of its divisors is an integer number (1441440).

Almost surely, 2^18959972 is an apocalyptic number.

It is an amenable number.

18959972 is a deficient number, since it is larger than the sum of its proper divisors (15634588).

18959972 is a wasteful number, since it uses less digits than its factorization.

18959972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1569 counting only the distinct ones).

The product of its digits is 408240, while the sum is 50.

The square root of 18959972 is about 4354.3049962078. The cubic root of 18959972 is about 266.6526457906.

The spelling of 18959972 in words is "eighteen million, nine hundred fifty-nine thousand, nine hundred seventy-two".