18981088 has 24 divisors (see below), whose sum is σ = 42707952. Its totient is φ = 8134656.

The previous prime is 18981077. The next prime is 18981089. The reversal of 18981088 is 88018981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18981089) 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, 42145 + ... + 42592.

It is an arithmetic number, because the mean of its divisors is an integer number (1779498).

Almost surely, 2^18981088 is an apocalyptic number.

It is an amenable number.

18981088 is an abundant number, since it is smaller than the sum of its proper divisors (23726864).

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

18981088 is an equidigital number, since it uses as much as digits as its factorization.

18981088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84754 (or 84746 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 43.

The square root of 18981088 is about 4356.7290482655. The cubic root of 18981088 is about 266.7516007232.

The spelling of 18981088 in words is "eighteen million, nine hundred eighty-one thousand, eighty-eight".