1321972 has 12 divisors (see below), whose sum is σ = 2328480. Its totient is φ = 656696.

The previous prime is 1321961. The next prime is 1321981. The reversal of 1321972 is 2791231.

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, 322 + ... + 1657.

It is an arithmetic number, because the mean of its divisors is an integer number (194040).

2^1321972 is an apocalyptic number.

It is an amenable number.

1321972 is a deficient number, since it is larger than the sum of its proper divisors (1006508).

1321972 is a wasteful number, since it uses less digits than its factorization.

1321972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 2148 counting only the distinct ones).

The product of its digits is 756, while the sum is 25.

The square root of 1321972 is about 1149.7704118649. The cubic root of 1321972 is about 109.7507303255.

The spelling of 1321972 in words is "one million, three hundred twenty-one thousand, nine hundred seventy-two".