18057243 has 4 divisors (see below), whose sum is σ = 24076328. Its totient is φ = 12038160.

The previous prime is 18057223. The next prime is 18057251. The reversal of 18057243 is 34275081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34275081 = 3 ⋅11425027.

It is a de Polignac number, because none of the positive numbers 2^k-18057243 is a prime.

It is a super-2 number, since 2×18057243² = 652128049522098, which contains 22 as substring.

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 18057243.

It is not an unprimeable number, because it can be changed into a prime (18057203) 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, 3009538 + ... + 3009543.

It is an arithmetic number, because the mean of its divisors is an integer number (6019082).

Almost surely, 2^18057243 is an apocalyptic number.

18057243 is a deficient number, since it is larger than the sum of its proper divisors (6019085).

18057243 is an equidigital number, since it uses as much as digits as its factorization.

18057243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6019084.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 18057243 is about 4249.3814844045. The cubic root of 18057243 is about 262.3516585902.

The spelling of 18057243 in words is "eighteen million, fifty-seven thousand, two hundred forty-three".