2021440 has 28 divisors (see below), whose sum is σ = 4814316. Its totient is φ = 808448.

The previous prime is 2021431. The next prime is 2021471. The reversal of 2021440 is 441202.

It can be written as a sum of positive squares in 2 ways, for example, as 906304 + 1115136 = 952^2 + 1056^2 .

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 2021440.

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, 2839 + ... + 3478.

2^2021440 is an apocalyptic number.

2021440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021440 is an abundant number, since it is smaller than the sum of its proper divisors (2792876).

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

2021440 is an equidigital number, since it uses as much as digits as its factorization.

2021440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6334 (or 6324 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2021440 is about 1421.7735403362. The cubic root of 2021440 is about 126.4407175343.

Adding to 2021440 its reverse (441202), we get a palindrome (2462642).

The spelling of 2021440 in words is "two million, twenty-one thousand, four hundred forty".