18377939 has 2 divisors, whose sum is σ = 18377940. Its totient is φ = 18377938.

The previous prime is 18377929. The next prime is 18377971. The reversal of 18377939 is 93977381.

It is a weak prime.

It is an emirp because it is prime and its reverse (93977381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18377939 - 2⁸ = 18377683 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18377893 and 18377902.

It is not a weakly prime, because it can be changed into another prime (18377929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9188969 + 9188970.

It is an arithmetic number, because the mean of its divisors is an integer number (9188970).

Almost surely, 2^18377939 is an apocalyptic number.

18377939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18377939 is an equidigital number, since it uses as much as digits as its factorization.

18377939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 47.

The square root of 18377939 is about 4286.9498480855. The cubic root of 18377939 is about 263.8956725438.

The spelling of 18377939 in words is "eighteen million, three hundred seventy-seven thousand, nine hundred thirty-nine".