2021872 has 20 divisors (see below), whose sum is σ = 3957336. Its totient is φ = 1000640.

The previous prime is 2021863. The next prime is 2021879. The reversal of 2021872 is 2781202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122 + ... + 2302.

2^2021872 is an apocalyptic number.

It is an amenable number.

2021872 is a deficient number, since it is larger than the sum of its proper divisors (1935464).

2021872 is a wasteful number, since it uses less digits than its factorization.

2021872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2021872 is about 1421.9254551488. The cubic root of 2021872 is about 126.4497240675.

The spelling of 2021872 in words is "two million, twenty-one thousand, eight hundred seventy-two".