2021739 has 8 divisors (see below), whose sum is σ = 2714112. Its totient is φ = 1338600.

The previous prime is 2021737. The next prime is 2021743. The reversal of 2021739 is 9371202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021739 - 2¹ = 2021737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1779 + ... + 2684.

It is an arithmetic number, because the mean of its divisors is an integer number (339264).

2^2021739 is an apocalyptic number.

2021739 is a deficient number, since it is larger than the sum of its proper divisors (692373).

2021739 is a wasteful number, since it uses less digits than its factorization.

2021739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4617.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 2021739 is about 1421.8786868084. The cubic root of 2021739 is about 126.4469513595.

The spelling of 2021739 in words is "two million, twenty-one thousand, seven hundred thirty-nine".