18242923 has 4 divisors (see below), whose sum is σ = 18423648. Its totient is φ = 18062200.

The previous prime is 18242899. The next prime is 18242951. The reversal of 18242923 is 32924281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32924281 = 13 ⋅2532637.

It is a cyclic number.

It is not a de Polignac number, because 18242923 - 2⁵ = 18242891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18242963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90211 + ... + 90412.

It is an arithmetic number, because the mean of its divisors is an integer number (4605912).

Almost surely, 2^18242923 is an apocalyptic number.

18242923 is a deficient number, since it is larger than the sum of its proper divisors (180725).

18242923 is a wasteful number, since it uses less digits than its factorization.

18242923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180724.

The product of its digits is 6912, while the sum is 31.

The square root of 18242923 is about 4271.1734921448. The cubic root of 18242923 is about 263.2478351218.

The spelling of 18242923 in words is "eighteen million, two hundred forty-two thousand, nine hundred twenty-three".