18364281 has 32 divisors (see below), whose sum is σ = 28062720. Its totient is φ = 10595904.

The previous prime is 18364277. The next prime is 18364343. The reversal of 18364281 is 18246381.

It is not a de Polignac number, because 18364281 - 2² = 18364277 is a prime.

It is a super-2 number, since 2×18364281² = 674493633293922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18364201) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 52750 + ... + 53096.

It is an arithmetic number, because the mean of its divisors is an integer number (876960).

Almost surely, 2^18364281 is an apocalyptic number.

It is an amenable number.

18364281 is a deficient number, since it is larger than the sum of its proper divisors (9698439).

18364281 is a wasteful number, since it uses less digits than its factorization.

18364281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445.

The product of its digits is 9216, while the sum is 33.

The square root of 18364281 is about 4285.3565779291. The cubic root of 18364281 is about 263.8302829058.

The spelling of 18364281 in words is "eighteen million, three hundred sixty-four thousand, two hundred eighty-one".