2797721 has 4 divisors (see below), whose sum is σ = 2845200. Its totient is φ = 2750244.

The previous prime is 2797699. The next prime is 2797723. The reversal of 2797721 is 1277972.

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-2797721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2797723) 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, 23651 + ... + 23768.

It is an arithmetic number, because the mean of its divisors is an integer number (711300).

2^2797721 is an apocalyptic number.

It is an amenable number.

2797721 is a deficient number, since it is larger than the sum of its proper divisors (47479).

2797721 is an equidigital number, since it uses as much as digits as its factorization.

2797721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47478.

The product of its digits is 12348, while the sum is 35.

The square root of 2797721 is about 1672.6389329440. The cubic root of 2797721 is about 140.9077242765.

It can be divided in two parts, 279 and 7721, that added together give a cube (8000 = 20³).

The spelling of 2797721 in words is "two million, seven hundred ninety-seven thousand, seven hundred twenty-one".