2822721 has 16 divisors (see below), whose sum is σ = 4285440. Its totient is φ = 1635920.

The previous prime is 2822719. The next prime is 2822723. The reversal of 2822721 is 1272282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2822719) and next prime (2822723).

It is not a de Polignac number, because 2822721 - 2¹ = 2822719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2822691 and 2822700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2822723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101 + ... + 2618.

It is an arithmetic number, because the mean of its divisors is an integer number (267840).

2^2822721 is an apocalyptic number.

It is an amenable number.

2822721 is a deficient number, since it is larger than the sum of its proper divisors (1462719).

2822721 is a wasteful number, since it uses less digits than its factorization.

2822721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3756.

The product of its digits is 896, while the sum is 24.

The square root of 2822721 is about 1680.0955329980. The cubic root of 2822721 is about 141.3261901328.

It can be divided in two parts, 282 and 2721, that added together give a palindrome (3003).

The spelling of 2822721 in words is "two million, eight hundred twenty-two thousand, seven hundred twenty-one".