18249642 has 24 divisors (see below), whose sum is σ = 40905540. Its totient is φ = 5873280.

The previous prime is 18249617. The next prime is 18249659. The reversal of 18249642 is 24694281.

18249642 is a `hidden beast` number, since 1 + 8 + 2 + 4 + 9 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18224361 + 25281 = 4269^2 + 159^2 .

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 18249597 and 18249606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16959 + ... + 18002.

Almost surely, 2^18249642 is an apocalyptic number.

18249642 is an abundant number, since it is smaller than the sum of its proper divisors (22655898).

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

18249642 is a wasteful number, since it uses less digits than its factorization.

18249642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34998 (or 34995 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 18249642 is about 4271.9599717226. The cubic root of 18249642 is about 263.2801498464.

The spelling of 18249642 in words is "eighteen million, two hundred forty-nine thousand, six hundred forty-two".