1331920 has 20 divisors (see below), whose sum is σ = 3096900. Its totient is φ = 532736.

The previous prime is 1331857. The next prime is 1331921. The reversal of 1331920 is 291331.

It can be written as a sum of positive squares in 2 ways, for example, as 760384 + 571536 = 872^2 + 756^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8245 + ... + 8404.

It is an arithmetic number, because the mean of its divisors is an integer number (154845).

2^1331920 is an apocalyptic number.

1331920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331920 is an abundant number, since it is smaller than the sum of its proper divisors (1764980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331920 is a wasteful number, since it uses less digits than its factorization.

1331920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16662 (or 16656 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 1331920 is about 1154.0883848302. The cubic root of 1331920 is about 110.0253385154.

The spelling of 1331920 in words is "one million, three hundred thirty-one thousand, nine hundred twenty".