1221982 has 8 divisors (see below), whose sum is σ = 1849536. Its totient is φ = 605472.

The previous prime is 1221971. The next prime is 1222003. The reversal of 1221982 is 2891221.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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, 2478 + ... + 2929.

It is an arithmetic number, because the mean of its divisors is an integer number (231192).

2^1221982 is an apocalyptic number.

1221982 is a deficient number, since it is larger than the sum of its proper divisors (627554).

1221982 is a wasteful number, since it uses less digits than its factorization.

1221982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5522.

The product of its digits is 576, while the sum is 25.

The square root of 1221982 is about 1105.4329468584. The cubic root of 1221982 is about 106.9108058043.

The spelling of 1221982 in words is "one million, two hundred twenty-one thousand, nine hundred eighty-two".