1821982 has 8 divisors (see below), whose sum is σ = 2738736. Its totient is φ = 909072.

The previous prime is 1821959. The next prime is 1821997. The reversal of 1821982 is 2891281.

It is a happy number.

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, 1183 + ... + 2245.

It is an arithmetic number, because the mean of its divisors is an integer number (342342).

2^1821982 is an apocalyptic number.

1821982 is a deficient number, since it is larger than the sum of its proper divisors (916754).

1821982 is a wasteful number, since it uses less digits than its factorization.

1821982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922.

The product of its digits is 2304, while the sum is 31.

The square root of 1821982 is about 1349.8081345139. The cubic root of 1821982 is about 122.1372190714.

The spelling of 1821982 in words is "one million, eight hundred twenty-one thousand, nine hundred eighty-two".