18768813 has 12 divisors (see below), whose sum is σ = 29111040. Its totient is φ = 10724952.

The previous prime is 18768809. The next prime is 18768817. The reversal of 18768813 is 31886781.

It is an interprime number because it is at equal distance from previous prime (18768809) and next prime (18768817).

It is not a de Polignac number, because 18768813 - 2² = 18768809 is a prime.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18768817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63693 + ... + 63986.

It is an arithmetic number, because the mean of its divisors is an integer number (2425920).

Almost surely, 2^18768813 is an apocalyptic number.

It is an amenable number.

18768813 is a deficient number, since it is larger than the sum of its proper divisors (10342227).

18768813 is a wasteful number, since it uses less digits than its factorization.

18768813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127696 (or 127689 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 18768813 is about 4332.2988124090. The cubic root of 18768813 is about 265.7534650204.

The spelling of 18768813 in words is "eighteen million, seven hundred sixty-eight thousand, eight hundred thirteen".