18327913 has 24 divisors (see below), whose sum is σ = 21182720. Its totient is φ = 15785280.

The previous prime is 18327899. The next prime is 18327919. The reversal of 18327913 is 31972381.

It is a de Polignac number, because none of the positive numbers 2^k-18327913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18327919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 495331 + ... + 495367.

Almost surely, 2^18327913 is an apocalyptic number.

It is an amenable number.

18327913 is a deficient number, since it is larger than the sum of its proper divisors (2854807).

18327913 is a wasteful number, since it uses less digits than its factorization.

18327913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 116 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 18327913 is about 4281.1111875306. Note that the first 4 decimals coincide. The cubic root of 18327913 is about 263.6560076272.

The spelling of 18327913 in words is "eighteen million, three hundred twenty-seven thousand, nine hundred thirteen".