1981982 has 8 divisors (see below), whose sum is σ = 2981016. Its totient is φ = 988312.

The previous prime is 1981963. The next prime is 1981997. The reversal of 1981982 is 2891891.

It is a sphenic number, since it is the product of 3 distinct 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 in 3 ways as a sum of consecutive naturals, for example, 233 + ... + 2004.

It is an arithmetic number, because the mean of its divisors is an integer number (372627).

2^1981982 is an apocalyptic number.

1981982 is a deficient number, since it is larger than the sum of its proper divisors (999034).

1981982 is a wasteful number, since it uses less digits than its factorization.

1981982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682.

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

The square root of 1981982 is about 1407.8288248221. The cubic root of 1981982 is about 125.6126087792.

Subtracting 1981982 from its reverse (2891891), we obtain a palindrome (909909).

The spelling of 1981982 in words is "one million, nine hundred eighty-one thousand, nine hundred eighty-two".