18797939 has 2 divisors, whose sum is σ = 18797940. Its totient is φ = 18797938.

The previous prime is 18797929. The next prime is 18797941. The reversal of 18797939 is 93979781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18797939 - 2¹⁶ = 18732403 is a prime.

It is a Sophie Germain prime.

Together with 18797941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18797929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9398969 + 9398970.

It is an arithmetic number, because the mean of its divisors is an integer number (9398970).

Almost surely, 2^18797939 is an apocalyptic number.

18797939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18797939 is an equidigital number, since it uses as much as digits as its factorization.

18797939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 53.

The square root of 18797939 is about 4335.6590041192. The cubic root of 18797939 is about 265.8908620058.

The spelling of 18797939 in words is "eighteen million, seven hundred ninety-seven thousand, nine hundred thirty-nine".