18977863 has 2 divisors, whose sum is σ = 18977864. Its totient is φ = 18977862.

The previous prime is 18977843. The next prime is 18977873. The reversal of 18977863 is 36877981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18977863 - 2⁹ = 18977351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18977813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9488931 + 9488932.

It is an arithmetic number, because the mean of its divisors is an integer number (9488932).

Almost surely, 2^18977863 is an apocalyptic number.

18977863 is a deficient number, since it is larger than the sum of its proper divisors (1).

18977863 is an equidigital number, since it uses as much as digits as its factorization.

18977863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 18977863 is about 4356.3589154247. The cubic root of 18977863 is about 266.7364923051.

The spelling of 18977863 in words is "eighteen million, nine hundred seventy-seven thousand, eight hundred sixty-three".