18187982 has 4 divisors (see below), whose sum is σ = 27281976. Its totient is φ = 9093990.

The previous prime is 18187973. The next prime is 18187987. The reversal of 18187982 is 28978181.

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 (18187987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4546994 + ... + 4546997.

It is an arithmetic number, because the mean of its divisors is an integer number (6820494).

Almost surely, 2^18187982 is an apocalyptic number.

18187982 is a deficient number, since it is larger than the sum of its proper divisors (9093994).

18187982 is an equidigital number, since it uses as much as digits as its factorization.

18187982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9093993.

The product of its digits is 64512, while the sum is 44.

The square root of 18187982 is about 4264.7370376144. The cubic root of 18187982 is about 262.9833007078.

The spelling of 18187982 in words is "eighteen million, one hundred eighty-seven thousand, nine hundred eighty-two".