18257442 has 64 divisors (see below), whose sum is σ = 44513280. Its totient is φ = 4876416.

The previous prime is 18257441. The next prime is 18257497. The reversal of 18257442 is 24475281.

It is a super-4 number, since 4×18257442⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (18257441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109243 + ... + 109409.

It is an arithmetic number, because the mean of its divisors is an integer number (695520).

Almost surely, 2^18257442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18257442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22256640).

18257442 is an abundant number, since it is smaller than the sum of its proper divisors (26255838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18257442 is a wasteful number, since it uses less digits than its factorization.

18257442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335.

The product of its digits is 17920, while the sum is 33.

The square root of 18257442 is about 4272.8728040980. The cubic root of 18257442 is about 263.3176536445.

The spelling of 18257442 in words is "eighteen million, two hundred fifty-seven thousand, four hundred forty-two".