18138382 has 4 divisors (see below), whose sum is σ = 27207576. Its totient is φ = 9069190.

The previous prime is 18138361. The next prime is 18138397. The reversal of 18138382 is 28383181.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4534594 + ... + 4534597.

It is an arithmetic number, because the mean of its divisors is an integer number (6801894).

Almost surely, 2^18138382 is an apocalyptic number.

18138382 is a deficient number, since it is larger than the sum of its proper divisors (9069194).

18138382 is an equidigital number, since it uses as much as digits as its factorization.

18138382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069193.

The product of its digits is 9216, while the sum is 34.

The square root of 18138382 is about 4258.9179376926. The cubic root of 18138382 is about 262.7440246296.

The spelling of 18138382 in words is "eighteen million, one hundred thirty-eight thousand, three hundred eighty-two".