2830721 has 8 divisors (see below), whose sum is σ = 3039624. Its totient is φ = 2626560.

The previous prime is 2830657. The next prime is 2830741. The reversal of 2830721 is 1270382.

It can be written as a sum of positive squares in 4 ways, for example, as 970225 + 1860496 = 985^2 + 1364^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2830721 - 2⁶ = 2830657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2830741) 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, 101 + ... + 2381.

It is an arithmetic number, because the mean of its divisors is an integer number (379953).

2^2830721 is an apocalyptic number.

It is an amenable number.

2830721 is a deficient number, since it is larger than the sum of its proper divisors (208903).

2830721 is a wasteful number, since it uses less digits than its factorization.

2830721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2830721 is about 1682.4746654853. The cubic root of 2830721 is about 141.4595771609.

The spelling of 2830721 in words is "two million, eight hundred thirty thousand, seven hundred twenty-one".