18168274 has 24 divisors (see below), whose sum is σ = 29644380. Its totient is φ = 8350944.

The previous prime is 18168251. The next prime is 18168277. The reversal of 18168274 is 47286181.

It can be written as a sum of positive squares in 2 ways, for example, as 18122049 + 46225 = 4257^2 + 215^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18168277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 422497 + ... + 422539.

Almost surely, 2^18168274 is an apocalyptic number.

18168274 is a deficient number, since it is larger than the sum of its proper divisors (11476106).

18168274 is an frugal number, since it uses more digits than its factorization.

18168274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 62 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 18168274 is about 4262.4258351319. The cubic root of 18168274 is about 262.8882792073. Note that the first 3 decimals are identical.

The spelling of 18168274 in words is "eighteen million, one hundred sixty-eight thousand, two hundred seventy-four".