18031382 has 4 divisors (see below), whose sum is σ = 27047076. Its totient is φ = 9015690.

The previous prime is 18031381. The next prime is 18031421. The reversal of 18031382 is 28313081.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18031381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4507844 + ... + 4507847.

It is an arithmetic number, because the mean of its divisors is an integer number (6761769).

Almost surely, 2^18031382 is an apocalyptic number.

18031382 is a deficient number, since it is larger than the sum of its proper divisors (9015694).

18031382 is an equidigital number, since it uses as much as digits as its factorization.

18031382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9015693.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18031382 is about 4246.3374807003. The cubic root of 18031382 is about 262.2263548962.

The spelling of 18031382 in words is "eighteen million, thirty-one thousand, three hundred eighty-two".