18868091 has 8 divisors (see below), whose sum is σ = 20866224. Its totient is φ = 16917120.

The previous prime is 18868081. The next prime is 18868097. The reversal of 18868091 is 19086881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18868091 - 2¹⁸ = 18605947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18868097) 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, 10946 + ... + 12551.

It is an arithmetic number, because the mean of its divisors is an integer number (2608278).

Almost surely, 2^18868091 is an apocalyptic number.

18868091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18868091 is a deficient number, since it is larger than the sum of its proper divisors (1998133).

18868091 is a wasteful number, since it uses less digits than its factorization.

18868091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23581.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 18868091 is about 4343.7415899199. The cubic root of 18868091 is about 266.2212106381.

The spelling of 18868091 in words is "eighteen million, eight hundred sixty-eight thousand, ninety-one".