18904988 has 24 divisors (see below), whose sum is σ = 35048832. Its totient is φ = 8903664.

The previous prime is 18904987. The next prime is 18904997. The reversal of 18904988 is 88940981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18904987) 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, 4631 + ... + 7697.

It is an arithmetic number, because the mean of its divisors is an integer number (1460368).

Almost surely, 2^18904988 is an apocalyptic number.

It is an amenable number.

18904988 is a deficient number, since it is larger than the sum of its proper divisors (16143844).

18904988 is a wasteful number, since it uses less digits than its factorization.

18904988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161 (or 3159 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 18904988 is about 4347.9866605131. The cubic root of 18904988 is about 266.3946316106.

The spelling of 18904988 in words is "eighteen million, nine hundred four thousand, nine hundred eighty-eight".