18930319 has 2 divisors, whose sum is σ = 18930320. Its totient is φ = 18930318.

The previous prime is 18930293. The next prime is 18930341. The reversal of 18930319 is 91303981.

It is a strong prime.

It is an emirp because it is prime and its reverse (91303981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18930319 - 2¹⁷ = 18799247 is a prime.

It is a super-2 number, since 2×18930319² = 716713954883522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18930349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9465159 + 9465160.

It is an arithmetic number, because the mean of its divisors is an integer number (9465160).

Almost surely, 2^18930319 is an apocalyptic number.

18930319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18930319 is an equidigital number, since it uses as much as digits as its factorization.

18930319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 18930319 is about 4350.8986428093. The cubic root of 18930319 is about 266.5135602011.

The spelling of 18930319 in words is "eighteen million, nine hundred thirty thousand, three hundred nineteen".