1920640 has 32 divisors (see below), whose sum is σ = 4593060. Its totient is φ = 768000.

The previous prime is 1920637. The next prime is 1920671. The reversal of 1920640 is 460291.

It can be written as a sum of positive squares in 2 ways, for example, as 1915456 + 5184 = 1384^2 + 72^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861 + ... + 2140.

2^1920640 is an apocalyptic number.

1920640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1920640 is an abundant number, since it is smaller than the sum of its proper divisors (2672420).

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

1920640 is an equidigital number, since it uses as much as digits as its factorization.

1920640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020 (or 3008 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1920640 is about 1385.8715669210. The cubic root of 1920640 is about 124.3031086263.

The spelling of 1920640 in words is "one million, nine hundred twenty thousand, six hundred forty".