18589919 has 2 divisors, whose sum is σ = 18589920. Its totient is φ = 18589918.

The previous prime is 18589871. The next prime is 18589927. The reversal of 18589919 is 91998581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18589919 - 2⁸ = 18589663 is a prime.

It is a super-2 number, since 2×18589919² = 691170176853122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18589979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9294959 + 9294960.

It is an arithmetic number, because the mean of its divisors is an integer number (9294960).

Almost surely, 2^18589919 is an apocalyptic number.

18589919 is a deficient number, since it is larger than the sum of its proper divisors (1).

18589919 is an equidigital number, since it uses as much as digits as its factorization.

18589919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 50.

The square root of 18589919 is about 4311.6028342137. The cubic root of 18589919 is about 264.9064295253.

The spelling of 18589919 in words is "eighteen million, five hundred eighty-nine thousand, nine hundred nineteen".