18868863 has 16 divisors (see below), whose sum is σ = 27969536. Its totient is φ = 11236320.

The previous prime is 18868859. The next prime is 18868867. The reversal of 18868863 is 36886881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18868859) and next prime (18868867).

It is not a de Polignac number, because 18868863 - 2² = 18868859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18868867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6595 + ... + 9012.

It is an arithmetic number, because the mean of its divisors is an integer number (1748096).

Almost surely, 2^18868863 is an apocalyptic number.

18868863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18868863 is a deficient number, since it is larger than the sum of its proper divisors (9100673).

18868863 is a wasteful number, since it uses less digits than its factorization.

18868863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15654.

The product of its digits is 442368, while the sum is 48.

The square root of 18868863 is about 4343.8304524924. The cubic root of 18868863 is about 266.2248414589.

The spelling of 18868863 in words is "eighteen million, eight hundred sixty-eight thousand, eight hundred sixty-three".