18979319 has 2 divisors, whose sum is σ = 18979320. Its totient is φ = 18979318.

The previous prime is 18979313. The next prime is 18979333. The reversal of 18979319 is 91397981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18979319 - 2⁸ = 18979063 is a prime.

It is a super-2 number, since 2×18979319² = 720429099407522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18979313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489659 + 9489660.

It is an arithmetic number, because the mean of its divisors is an integer number (9489660).

Almost surely, 2^18979319 is an apocalyptic number.

18979319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18979319 is an equidigital number, since it uses as much as digits as its factorization.

18979319 is an evil number, because the sum of its binary digits is even.

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

The square root of 18979319 is about 4356.5260242537. The cubic root of 18979319 is about 266.7433135579.

The spelling of 18979319 in words is "eighteen million, nine hundred seventy-nine thousand, three hundred nineteen".