18257042 has 4 divisors (see below), whose sum is σ = 27385566. Its totient is φ = 9128520.

The previous prime is 18257039. The next prime is 18257051. The reversal of 18257042 is 24075281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 1125721 = 4139^2 + 1061^2 .

It is a super-4 number, since 4×18257042⁴ (a number of 30 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18256996 and 18257014.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4564259 + ... + 4564262.

Almost surely, 2^18257042 is an apocalyptic number.

18257042 is a deficient number, since it is larger than the sum of its proper divisors (9128524).

18257042 is an equidigital number, since it uses as much as digits as its factorization.

18257042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9128523.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18257042 is about 4272.8259969252. The cubic root of 18257042 is about 263.3157306327.

The spelling of 18257042 in words is "eighteen million, two hundred fifty-seven thousand, forty-two".