18634988 has 12 divisors (see below), whose sum is σ = 32642232. Its totient is φ = 9308640.

The previous prime is 18634981. The next prime is 18634997. The reversal of 18634988 is 88943681.

It is not an unprimeable number, because it can be changed into a prime (18634981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5531 + ... + 8237.

It is an arithmetic number, because the mean of its divisors is an integer number (2720186).

Almost surely, 2^18634988 is an apocalyptic number.

It is an amenable number.

18634988 is a deficient number, since it is larger than the sum of its proper divisors (14007244).

18634988 is a wasteful number, since it uses less digits than its factorization.

18634988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4432 (or 4430 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 18634988 is about 4316.8261489201. The cubic root of 18634988 is about 265.1203345738.

The spelling of 18634988 in words is "eighteen million, six hundred thirty-four thousand, nine hundred eighty-eight".