18168922 has 4 divisors (see below), whose sum is σ = 27253386. Its totient is φ = 9084460.

The previous prime is 18168901. The next prime is 18168923. The reversal of 18168922 is 22986181.

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., 18054001 + 114921 = 4249^2 + 339^2 .

It is not an unprimeable number, because it can be changed into a prime (18168923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4542229 + ... + 4542232.

Almost surely, 2^18168922 is an apocalyptic number.

18168922 is a deficient number, since it is larger than the sum of its proper divisors (9084464).

18168922 is an equidigital number, since it uses as much as digits as its factorization.

18168922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9084463.

The product of its digits is 13824, while the sum is 37.

The square root of 18168922 is about 4262.5018475069. The cubic root of 18168922 is about 262.8914046111.

The spelling of 18168922 in words is "eighteen million, one hundred sixty-eight thousand, nine hundred twenty-two".