19921982 has 16 divisors (see below), whose sum is σ = 30868992. Its totient is φ = 9636480.

The previous prime is 19921973. The next prime is 19921991. The reversal of 19921982 is 28912991.

It is an interprime number because it is at equal distance from previous prime (19921973) and next prime (19921991).

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9458 + ... + 11370.

It is an arithmetic number, because the mean of its divisors is an integer number (1929312).

Almost surely, 2^19921982 is an apocalyptic number.

19921982 is a deficient number, since it is larger than the sum of its proper divisors (10947010).

19921982 is a wasteful number, since it uses less digits than its factorization.

19921982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083.

The product of its digits is 23328, while the sum is 41.

The square root of 19921982 is about 4463.4047542207. The cubic root of 19921982 is about 271.0883459913.

The spelling of 19921982 in words is "nineteen million, nine hundred twenty-one thousand, nine hundred eighty-two".