18242023 has 4 divisors (see below), whose sum is σ = 18514360. Its totient is φ = 17969688.

The previous prime is 18242011. The next prime is 18242041. The reversal of 18242023 is 32024281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32024281 = 5659².

It is a cyclic number.

It is not a de Polignac number, because 18242023 - 2⁵ = 18241991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18241985 and 18242003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18242053) 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, 136068 + ... + 136201.

It is an arithmetic number, because the mean of its divisors is an integer number (4628590).

Almost surely, 2^18242023 is an apocalyptic number.

18242023 is a deficient number, since it is larger than the sum of its proper divisors (272337).

18242023 is an equidigital number, since it uses as much as digits as its factorization.

18242023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272336.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 18242023 is about 4271.0681333830. The cubic root of 18242023 is about 263.2435060102.

The spelling of 18242023 in words is "eighteen million, two hundred forty-two thousand, twenty-three".