18156242 has 16 divisors (see below), whose sum is σ = 29446872. Its totient is φ = 8346240.

The previous prime is 18156227. The next prime is 18156251. The reversal of 18156242 is 24265181.

It can be written as a sum of positive squares in 4 ways, for example, as 3094081 + 15062161 = 1759^2 + 3881^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5942 + ... + 8462.

Almost surely, 2^18156242 is an apocalyptic number.

18156242 is a deficient number, since it is larger than the sum of its proper divisors (11290630).

18156242 is a wasteful number, since it uses less digits than its factorization.

18156242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813.

The product of its digits is 3840, while the sum is 29.

The square root of 18156242 is about 4261.0141985213. The cubic root of 18156242 is about 262.8302335121.

The spelling of 18156242 in words is "eighteen million, one hundred fifty-six thousand, two hundred forty-two".