18919379 has 2 divisors, whose sum is σ = 18919380. Its totient is φ = 18919378.

The previous prime is 18919361. The next prime is 18919391. The reversal of 18919379 is 97391981.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (97391981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18919379 - 2¹² = 18915283 is a prime.

It is not a weakly prime, because it can be changed into another prime (18919309) 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, 9459689 + 9459690.

It is an arithmetic number, because the mean of its divisors is an integer number (9459690).

Almost surely, 2^18919379 is an apocalyptic number.

18919379 is a deficient number, since it is larger than the sum of its proper divisors (1).

18919379 is an equidigital number, since it uses as much as digits as its factorization.

18919379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 18919379 is about 4349.6412495745. The cubic root of 18919379 is about 266.4622101210.

The spelling of 18919379 in words is "eighteen million, nine hundred nineteen thousand, three hundred seventy-nine".