18158252 has 12 divisors (see below), whose sum is σ = 36316560. Its totient is φ = 7782096.

The previous prime is 18158237. The next prime is 18158317. The reversal of 18158252 is 25285181.

It is a happy number.

18158252 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324227 + ... + 324282.

It is an arithmetic number, because the mean of its divisors is an integer number (3026380).

Almost surely, 2^18158252 is an apocalyptic number.

It is an amenable number.

18158252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18158252 is a wasteful number, since it uses less digits than its factorization.

18158252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648520 (or 648518 counting only the distinct ones).

The product of its digits is 6400, while the sum is 32.

The square root of 18158252 is about 4261.2500513347. The cubic root of 18158252 is about 262.8399320917.

The spelling of 18158252 in words is "eighteen million, one hundred fifty-eight thousand, two hundred fifty-two".