18121323 has 12 divisors (see below), whose sum is σ = 26558504. Its totient is φ = 10982400.

The previous prime is 18121297. The next prime is 18121351. The reversal of 18121323 is 32312181.

It is not a de Polignac number, because 18121323 - 2⁸ = 18121067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18121323.

It is not an unprimeable number, because it can be changed into a prime (18121393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24598 + ... + 25323.

Almost surely, 2^18121323 is an apocalyptic number.

18121323 is a deficient number, since it is larger than the sum of its proper divisors (8437181).

18121323 is a wasteful number, since it uses less digits than its factorization.

18121323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49946 (or 49935 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 18121323 is about 4256.9147278281. The cubic root of 18121323 is about 262.6616292577.

The spelling of 18121323 in words is "eighteen million, one hundred twenty-one thousand, three hundred twenty-three".