2279721 has 8 divisors (see below), whose sum is σ = 3046624. Its totient is φ = 1516320.

The previous prime is 2279707. The next prime is 2279741. The reversal of 2279721 is 1279722.

It is a happy number.

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

It is not a de Polignac number, because 2279721 - 2⁶ = 2279657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2279741) 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, 1965 + ... + 2901.

It is an arithmetic number, because the mean of its divisors is an integer number (380828).

2^2279721 is an apocalyptic number.

It is an amenable number.

2279721 is a deficient number, since it is larger than the sum of its proper divisors (766903).

2279721 is an equidigital number, since it uses as much as digits as its factorization.

2279721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751.

The product of its digits is 3528, while the sum is 30.

The square root of 2279721 is about 1509.8744980958. The cubic root of 2279721 is about 131.6115185023.

Subtracting from 2279721 its reverse (1279722), we obtain a palindrome (999999).

The spelling of 2279721 in words is "two million, two hundred seventy-nine thousand, seven hundred twenty-one".