18517379 has 2 divisors, whose sum is σ = 18517380. Its totient is φ = 18517378.

The previous prime is 18517361. The next prime is 18517451. The reversal of 18517379 is 97371581.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18517379 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18517339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9258689 + 9258690.

It is an arithmetic number, because the mean of its divisors is an integer number (9258690).

Almost surely, 2^18517379 is an apocalyptic number.

18517379 is a deficient number, since it is larger than the sum of its proper divisors (1).

18517379 is an equidigital number, since it uses as much as digits as its factorization.

18517379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 41.

The square root of 18517379 is about 4303.1824269952. The cubic root of 18517379 is about 264.5614152647.

The spelling of 18517379 in words is "eighteen million, five hundred seventeen thousand, three hundred seventy-nine".