18800091 has 12 divisors (see below), whose sum is σ = 28092480. Its totient is φ = 12101040.

The previous prime is 18800087. The next prime is 18800137. The reversal of 18800091 is 19000881.

It is not a de Polignac number, because 18800091 - 2² = 18800087 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18800051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35755 + ... + 36276.

It is an arithmetic number, because the mean of its divisors is an integer number (2341040).

Almost surely, 2^18800091 is an apocalyptic number.

18800091 is a deficient number, since it is larger than the sum of its proper divisors (9292389).

18800091 is a wasteful number, since it uses less digits than its factorization.

18800091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72066 (or 72063 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 18800091 is about 4335.9071715156. The cubic root of 18800091 is about 265.9010080702.

The spelling of 18800091 in words is "eighteen million, eight hundred thousand, ninety-one".