18668988 has 48 divisors (see below), whose sum is σ = 52128160. Its totient is φ = 5743872.

The previous prime is 18668959. The next prime is 18669017. The reversal of 18668988 is 88986681.

It is an interprime number because it is at equal distance from previous prime (18668959) and next prime (18669017).

It is a super-2 number, since 2×18668988² = 697062225888288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5245 + ... + 8052.

Almost surely, 2^18668988 is an apocalyptic number.

18668988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18668988 is an abundant number, since it is smaller than the sum of its proper divisors (33459172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18668988 is a wasteful number, since it uses less digits than its factorization.

18668988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13323 (or 13315 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 18668988 is about 4320.7624327195. The cubic root of 18668988 is about 265.2814761637.

The spelling of 18668988 in words is "eighteen million, six hundred sixty-eight thousand, nine hundred eighty-eight".