18557243 has 8 divisors (see below), whose sum is σ = 19661520. Its totient is φ = 17465760.

The previous prime is 18557233. The next prime is 18557263. The reversal of 18557243 is 34275581.

It is a happy number.

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 18557243 - 2¹² = 18553147 is a prime.

It is a super-2 number, since 2×18557243² = 688742535522098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18557233) 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, 128 + ... + 6093.

It is an arithmetic number, because the mean of its divisors is an integer number (2457690).

Almost surely, 2^18557243 is an apocalyptic number.

18557243 is a deficient number, since it is larger than the sum of its proper divisors (1104277).

18557243 is a wasteful number, since it uses less digits than its factorization.

18557243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6397.

The product of its digits is 33600, while the sum is 35.

The square root of 18557243 is about 4307.8118575444. The cubic root of 18557243 is about 264.7511274478.

The spelling of 18557243 in words is "eighteen million, five hundred fifty-seven thousand, two hundred forty-three".