18168442 has 8 divisors (see below), whose sum is σ = 28192500. Its totient is φ = 8770944.

The previous prime is 18168439. The next prime is 18168467. The reversal of 18168442 is 24486181.

It can be written as a sum of positive squares in 2 ways, for example, as 18156121 + 12321 = 4261^2 + 111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18168398 and 18168407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156567 + ... + 156682.

Almost surely, 2^18168442 is an apocalyptic number.

18168442 is a deficient number, since it is larger than the sum of its proper divisors (10024058).

18168442 is a wasteful number, since it uses less digits than its factorization.

18168442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313280.

The product of its digits is 12288, while the sum is 34.

The square root of 18168442 is about 4262.4455421741. The cubic root of 18168442 is about 262.8890895043.

The spelling of 18168442 in words is "eighteen million, one hundred sixty-eight thousand, four hundred forty-two".