18168842 has 4 divisors (see below), whose sum is σ = 27253266. Its totient is φ = 9084420.

The previous prime is 18168823. The next prime is 18168851. The reversal of 18168842 is 24886181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9174841 + 8994001 = 3029^2 + 2999^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18168796 and 18168805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4542209 + ... + 4542212.

Almost surely, 2^18168842 is an apocalyptic number.

18168842 is a deficient number, since it is larger than the sum of its proper divisors (9084424).

18168842 is an equidigital number, since it uses as much as digits as its factorization.

18168842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9084423.

The product of its digits is 24576, while the sum is 38.

The square root of 18168842 is about 4262.4924633364. The cubic root of 18168842 is about 262.8910187628.

The spelling of 18168842 in words is "eighteen million, one hundred sixty-eight thousand, eight hundred forty-two".