18338913 has 8 divisors (see below), whose sum is σ = 27168800. Its totient is φ = 12225924.

The previous prime is 18338867. The next prime is 18338921. The reversal of 18338913 is 31983381.

It is not a de Polignac number, because 18338913 - 2¹³ = 18330721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18338993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339583 + ... + 339636.

It is an arithmetic number, because the mean of its divisors is an integer number (3396100).

Almost surely, 2^18338913 is an apocalyptic number.

It is an amenable number.

18338913 is a deficient number, since it is larger than the sum of its proper divisors (8829887).

18338913 is an equidigital number, since it uses as much as digits as its factorization.

18338913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679228 (or 679222 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 18338913 is about 4282.3957080120. The cubic root of 18338913 is about 263.7087438746.

The spelling of 18338913 in words is "eighteen million, three hundred thirty-eight thousand, nine hundred thirteen".