18934879 has 2 divisors, whose sum is σ = 18934880. Its totient is φ = 18934878.

The previous prime is 18934847. The next prime is 18934897. The reversal of 18934879 is 97843981.

It is a happy number.

Together with next prime (18934897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (97843981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18934879 - 2⁵ = 18934847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18934829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9467439 + 9467440.

It is an arithmetic number, because the mean of its divisors is an integer number (9467440).

Almost surely, 2^18934879 is an apocalyptic number.

18934879 is a deficient number, since it is larger than the sum of its proper divisors (1).

18934879 is an equidigital number, since it uses as much as digits as its factorization.

18934879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 18934879 is about 4351.4226409302. The cubic root of 18934879 is about 266.5349580491.

The spelling of 18934879 in words is "eighteen million, nine hundred thirty-four thousand, eight hundred seventy-nine".