18019982 has 4 divisors (see below), whose sum is σ = 27029976. Its totient is φ = 9009990.

The previous prime is 18019943. The next prime is 18019993. The reversal of 18019982 is 28991081.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4504994 + ... + 4504997.

It is an arithmetic number, because the mean of its divisors is an integer number (6757494).

Almost surely, 2^18019982 is an apocalyptic number.

18019982 is a deficient number, since it is larger than the sum of its proper divisors (9009994).

18019982 is an equidigital number, since it uses as much as digits as its factorization.

18019982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9009993.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 18019982 is about 4244.9949352149. The cubic root of 18019982 is about 262.1710806959.

The spelling of 18019982 in words is "eighteen million, nineteen thousand, nine hundred eighty-two".