2719721 has 4 divisors (see below), whose sum is σ = 2725632. Its totient is φ = 2713812.

The previous prime is 2719709. The next prime is 2719741. The reversal of 2719721 is 1279172.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2719721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2719741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2201 + ... + 3206.

It is an arithmetic number, because the mean of its divisors is an integer number (681408).

2^2719721 is an apocalyptic number.

It is an amenable number.

2719721 is a deficient number, since it is larger than the sum of its proper divisors (5911).

2719721 is an equidigital number, since it uses as much as digits as its factorization.

2719721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5910.

The product of its digits is 1764, while the sum is 29.

The square root of 2719721 is about 1649.1576637787. The cubic root of 2719721 is about 139.5858680067.

The spelling of 2719721 in words is "two million, seven hundred nineteen thousand, seven hundred twenty-one".