2079721 has 12 divisors (see below), whose sum is σ = 2511552. Its totient is φ = 1686744.

The previous prime is 2079719. The next prime is 2079739. The reversal of 2079721 is 1279702.

It is a happy number.

It is not a de Polignac number, because 2079721 - 2¹ = 2079719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2079721.

It is not an unprimeable number, because it can be changed into a prime (2079761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2116 + ... + 2938.

It is an arithmetic number, because the mean of its divisors is an integer number (209296).

2^2079721 is an apocalyptic number.

It is an amenable number.

2079721 is a deficient number, since it is larger than the sum of its proper divisors (431831).

2079721 is an equidigital number, since it uses as much as digits as its factorization.

2079721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 2079721 is about 1442.1237810951. The cubic root of 2079721 is about 127.6443782903.

The spelling of 2079721 in words is "two million, seventy-nine thousand, seven hundred twenty-one".