18240723 has 12 divisors (see below), whose sum is σ = 26389168. Its totient is φ = 12141360.

The previous prime is 18240713. The next prime is 18240743. The reversal of 18240723 is 32704281.

It is not a de Polignac number, because 18240723 - 2⁴ = 18240707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18240713) 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, 6738 + ... + 9048.

Almost surely, 2^18240723 is an apocalyptic number.

18240723 is a deficient number, since it is larger than the sum of its proper divisors (8148445).

18240723 is a wasteful number, since it uses less digits than its factorization.

18240723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194 (or 3191 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18240723 is about 4270.9159439165. The cubic root of 18240723 is about 263.2372525977.

The spelling of 18240723 in words is "eighteen million, two hundred forty thousand, seven hundred twenty-three".