18093913 has 4 divisors (see below), whose sum is σ = 18115200. Its totient is φ = 18072628.

The previous prime is 18093827. The next prime is 18093931. The reversal of 18093913 is 31939081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31939081 = 1979 ⋅16139.

It is a cyclic number.

It is not a de Polignac number, because 18093913 - 2⁹ = 18093401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18093983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9313 + ... + 11086.

It is an arithmetic number, because the mean of its divisors is an integer number (4528800).

Almost surely, 2^18093913 is an apocalyptic number.

It is an amenable number.

18093913 is a deficient number, since it is larger than the sum of its proper divisors (21287).

18093913 is an equidigital number, since it uses as much as digits as its factorization.

18093913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21286.

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

The square root of 18093913 is about 4253.6940416537. The cubic root of 18093913 is about 262.5291299495.

Subtracting from 18093913 its product of nonzero digits (5832), we obtain a palindrome (18088081).

The spelling of 18093913 in words is "eighteen million, ninety-three thousand, nine hundred thirteen".