18915079 has 2 divisors, whose sum is σ = 18915080. Its totient is φ = 18915078.

The previous prime is 18915077. The next prime is 18915107. The reversal of 18915079 is 97051981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18915079 - 2¹ = 18915077 is a prime.

Together with 18915077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18915077) 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, 9457539 + 9457540.

It is an arithmetic number, because the mean of its divisors is an integer number (9457540).

Almost surely, 2^18915079 is an apocalyptic number.

18915079 is a deficient number, since it is larger than the sum of its proper divisors (1).

18915079 is an equidigital number, since it uses as much as digits as its factorization.

18915079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 18915079 is about 4349.1469278469. The cubic root of 18915079 is about 266.4420213978.

The spelling of 18915079 in words is "eighteen million, nine hundred fifteen thousand, seventy-nine".