18325881 has 48 divisors (see below), whose sum is σ = 32617728. Its totient is φ = 9676800.

The previous prime is 18325849. The next prime is 18325889. The reversal of 18325881 is 18852381.

It is not a de Polignac number, because 18325881 - 2⁵ = 18325849 is a prime.

It is a super-2 number, since 2×18325881² = 671675828852322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18325889) 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 47 ways as a sum of consecutive naturals, for example, 75921 + ... + 76161.

It is an arithmetic number, because the mean of its divisors is an integer number (679536).

Almost surely, 2^18325881 is an apocalyptic number.

It is an amenable number.

18325881 is a deficient number, since it is larger than the sum of its proper divisors (14291847).

18325881 is a wasteful number, since it uses less digits than its factorization.

18325881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 339 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 18325881 is about 4280.8738593890. The cubic root of 18325881 is about 263.6462634952.

The spelling of 18325881 in words is "eighteen million, three hundred twenty-five thousand, eight hundred eighty-one".