18810198 has 32 divisors (see below), whose sum is σ = 45601920. Its totient is φ = 5699880.

The previous prime is 18810179. The next prime is 18810217. The reversal of 18810198 is 89101881.

It is an interprime number because it is at equal distance from previous prime (18810179) and next prime (18810217).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

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, 15240 + ... + 16427.

It is an arithmetic number, because the mean of its divisors is an integer number (1425060).

Almost surely, 2^18810198 is an apocalyptic number.

18810198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18810198 is an abundant number, since it is smaller than the sum of its proper divisors (26791722).

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

18810198 is a wasteful number, since it uses less digits than its factorization.

18810198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31689 (or 31683 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 18810198 is about 4337.0725149575. The cubic root of 18810198 is about 265.9486493296.

The spelling of 18810198 in words is "eighteen million, eight hundred ten thousand, one hundred ninety-eight".