18630863 has 2 divisors, whose sum is σ = 18630864. Its totient is φ = 18630862.

The previous prime is 18630853. The next prime is 18630877. The reversal of 18630863 is 36803681.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18630863 - 2²⁰ = 17582287 is a prime.

It is a super-2 number, since 2×18630863² = 694218112249538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18630823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9315431 + 9315432.

It is an arithmetic number, because the mean of its divisors is an integer number (9315432).

Almost surely, 2^18630863 is an apocalyptic number.

18630863 is a deficient number, since it is larger than the sum of its proper divisors (1).

18630863 is an equidigital number, since it uses as much as digits as its factorization.

18630863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 18630863 is about 4316.3483409011. The cubic root of 18630863 is about 265.1007709786.

The spelling of 18630863 in words is "eighteen million, six hundred thirty thousand, eight hundred sixty-three".