18257243 has 8 divisors (see below), whose sum is σ = 18947712. Its totient is φ = 17577216.

The previous prime is 18257207. The next prime is 18257249. The reversal of 18257243 is 34275281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18257243 - 2¹⁰ = 18256219 is a prime.

It is a super-4 number, since 4×18257243⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18257249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1046 + ... + 6132.

It is an arithmetic number, because the mean of its divisors is an integer number (2368464).

Almost surely, 2^18257243 is an apocalyptic number.

18257243 is a deficient number, since it is larger than the sum of its proper divisors (690469).

18257243 is an equidigital number, since it uses as much as digits as its factorization.

18257243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221.

The product of its digits is 13440, while the sum is 32.

The square root of 18257243 is about 4272.8495175936. The cubic root of 18257243 is about 263.3166969497.

The spelling of 18257243 in words is "eighteen million, two hundred fifty-seven thousand, two hundred forty-three".