18073881 has 16 divisors (see below), whose sum is σ = 30601600. Its totient is φ = 10327824.

The previous prime is 18073877. The next prime is 18073919. The reversal of 18073881 is 18837081.

It is not a de Polignac number, because 18073881 - 2² = 18073877 is a prime.

It is a super-2 number, since 2×18073881² = 653330348804322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18073981) 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 15 ways as a sum of consecutive naturals, for example, 47626 + ... + 48003.

It is an arithmetic number, because the mean of its divisors is an integer number (1912600).

Almost surely, 2^18073881 is an apocalyptic number.

It is an amenable number.

18073881 is a deficient number, since it is larger than the sum of its proper divisors (12527719).

18073881 is an equidigital number, since it uses as much as digits as its factorization.

18073881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95645 (or 95639 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 18073881 is about 4251.3387303295. The cubic root of 18073881 is about 262.4322110669.

The spelling of 18073881 in words is "eighteen million, seventy-three thousand, eight hundred eighty-one".