18198880 has 48 divisors (see below), whose sum is σ = 49140000. Its totient is φ = 6239232.

The previous prime is 18198841. The next prime is 18198889. The reversal of 18198880 is 8889181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198889) 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, 7005 + ... + 9244.

It is an arithmetic number, because the mean of its divisors is an integer number (1023750).

Almost surely, 2^18198880 is an apocalyptic number.

18198880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18198880 is an abundant number, since it is smaller than the sum of its proper divisors (30941120).

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

18198880 is a wasteful number, since it uses less digits than its factorization.

18198880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16271 (or 16263 counting only the distinct ones).

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

The square root of 18198880 is about 4266.0145334961. The cubic root of 18198880 is about 263.0358156007.

The spelling of 18198880 in words is "eighteen million, one hundred ninety-eight thousand, eight hundred eighty".