18008442 has 24 divisors (see below), whose sum is σ = 39099060. Its totient is φ = 5990400.

The previous prime is 18008413. The next prime is 18008467. The reversal of 18008442 is 24480081.

It can be written as a sum of positive squares in 2 ways, for example, as 14907321 + 3101121 = 3861^2 + 1761^2 .

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, 13192 + ... + 14492.

Almost surely, 2^18008442 is an apocalyptic number.

18008442 is an abundant number, since it is smaller than the sum of its proper divisors (21090618).

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

18008442 is a wasteful number, since it uses less digits than its factorization.

18008442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078 (or 2075 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 18008442 is about 4243.6354697358. The cubic root of 18008442 is about 262.1151039412.

The spelling of 18008442 in words is "eighteen million, eight thousand, four hundred forty-two".