18913369 has 2 divisors, whose sum is σ = 18913370. Its totient is φ = 18913368.

The previous prime is 18913289. The next prime is 18913373. The reversal of 18913369 is 96331981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12334144 + 6579225 = 3512^2 + 2565^2 .

It is a cyclic number.

It is not a de Polignac number, because 18913369 - 2¹⁵ = 18880601 is a prime.

It is a super-2 number, since 2×18913369² = 715431053860322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18913969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9456684 + 9456685.

It is an arithmetic number, because the mean of its divisors is an integer number (9456685).

Almost surely, 2^18913369 is an apocalyptic number.

It is an amenable number.

18913369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18913369 is an equidigital number, since it uses as much as digits as its factorization.

18913369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 18913369 is about 4348.9503331264. The cubic root of 18913369 is about 266.4339920087.

The spelling of 18913369 in words is "eighteen million, nine hundred thirteen thousand, three hundred sixty-nine".