1982091 has 8 divisors (see below), whose sum is σ = 2649600. Its totient is φ = 1317992.

The previous prime is 1982087. The next prime is 1982093. The reversal of 1982091 is 1902891.

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

It is a cyclic number.

It is not a de Polignac number, because 1982091 - 2² = 1982087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982093) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1246 + ... + 2348.

It is an arithmetic number, because the mean of its divisors is an integer number (331200).

2^1982091 is an apocalyptic number.

1982091 is a deficient number, since it is larger than the sum of its proper divisors (667509).

1982091 is a wasteful number, since it uses less digits than its factorization.

1982091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1982091 is about 1407.8675363826. The cubic root of 1982091 is about 125.6149114445.

The spelling of 1982091 in words is "one million, nine hundred eighty-two thousand, ninety-one".