18327381 has 16 divisors (see below), whose sum is σ = 26112000. Its totient is φ = 11400048.

The previous prime is 18327341. The next prime is 18327383. The reversal of 18327381 is 18372381.

It is not a de Polignac number, because 18327381 - 2⁶ = 18327317 is a prime.

It is a super-2 number, since 2×18327381² = 671785788638322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18327383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1420 + ... + 6218.

It is an arithmetic number, because the mean of its divisors is an integer number (1632000).

Almost surely, 2^18327381 is an apocalyptic number.

It is an amenable number.

18327381 is a deficient number, since it is larger than the sum of its proper divisors (7784619).

18327381 is a wasteful number, since it uses less digits than its factorization.

18327381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4888.

The product of its digits is 8064, while the sum is 33.

The square root of 18327381 is about 4281.0490536783. The cubic root of 18327381 is about 263.6534565756.

The spelling of 18327381 in words is "eighteen million, three hundred twenty-seven thousand, three hundred eighty-one".