18478988 has 24 divisors (see below), whose sum is σ = 35610960. Its totient is φ = 8320320.

The previous prime is 18478973. The next prime is 18479009. The reversal of 18478988 is 88987481.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2870 + ... + 6722.

It is an arithmetic number, because the mean of its divisors is an integer number (1483790).

Almost surely, 2^18478988 is an apocalyptic number.

It is an amenable number.

18478988 is a deficient number, since it is larger than the sum of its proper divisors (17131972).

18478988 is a wasteful number, since it uses less digits than its factorization.

18478988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977 (or 3975 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 53.

The square root of 18478988 is about 4298.7193441768. The cubic root of 18478988 is about 264.3784555247.

The spelling of 18478988 in words is "eighteen million, four hundred seventy-eight thousand, nine hundred eighty-eight".