18168272 has 20 divisors (see below), whose sum is σ = 35310240. Its totient is φ = 9055968.

The previous prime is 18168251. The next prime is 18168277. The reversal of 18168272 is 27286181.

It is a super-2 number, since 2×18168272² = 660172214931968, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4163 + ... + 7325.

It is an arithmetic number, because the mean of its divisors is an integer number (1765512).

Almost surely, 2^18168272 is an apocalyptic number.

It is an amenable number.

18168272 is a deficient number, since it is larger than the sum of its proper divisors (17141968).

18168272 is a wasteful number, since it uses less digits than its factorization.

18168272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3530 (or 3524 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 18168272 is about 4262.4256005237. The cubic root of 18168272 is about 262.8882695608. Note that the first 3 decimals are identical.

The spelling of 18168272 in words is "eighteen million, one hundred sixty-eight thousand, two hundred seventy-two".