18001982 has 8 divisors (see below), whose sum is σ = 27934200. Its totient is φ = 8690584.

The previous prime is 18001981. The next prime is 18001999. The reversal of 18001982 is 28910081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18001981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155132 + ... + 155247.

It is an arithmetic number, because the mean of its divisors is an integer number (3491775).

Almost surely, 2^18001982 is an apocalyptic number.

18001982 is a deficient number, since it is larger than the sum of its proper divisors (9932218).

18001982 is a wasteful number, since it uses less digits than its factorization.

18001982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310410.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 18001982 is about 4242.8742616297. The cubic root of 18001982 is about 262.0837581594.

The spelling of 18001982 in words is "eighteen million, one thousand, nine hundred eighty-two".