18868831 has 2 divisors, whose sum is σ = 18868832. Its totient is φ = 18868830.

The previous prime is 18868813. The next prime is 18868859. The reversal of 18868831 is 13886881.

Together with previous prime (18868813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13886881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18868831 - 2¹⁵ = 18836063 is a prime.

It is a super-2 number, since 2×18868831² = 712065566613122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18868891) 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 as a sum of consecutive naturals, namely, 9434415 + 9434416.

It is an arithmetic number, because the mean of its divisors is an integer number (9434416).

Almost surely, 2^18868831 is an apocalyptic number.

18868831 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868831 is an equidigital number, since it uses as much as digits as its factorization.

18868831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 43.

The square root of 18868831 is about 4343.8267691058. The cubic root of 18868831 is about 266.2246909605.

The spelling of 18868831 in words is "eighteen million, eight hundred sixty-eight thousand, eight hundred thirty-one".