1331872 has 12 divisors (see below), whose sum is σ = 2622186. Its totient is φ = 665920.

The previous prime is 1331857. The next prime is 1331921. The reversal of 1331872 is 2781331.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 156816 = 1084^2 + 396^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20779 + ... + 20842.

2^1331872 is an apocalyptic number.

It is an amenable number.

1331872 is a deficient number, since it is larger than the sum of its proper divisors (1290314).

1331872 is an equidigital number, since it uses as much as digits as its factorization.

1331872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41631 (or 41623 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 1331872 is about 1154.0675890085. The cubic root of 1331872 is about 110.0240167945.

The spelling of 1331872 in words is "one million, three hundred thirty-one thousand, eight hundred seventy-two".