2798857 has 4 divisors (see below), whose sum is σ = 2804116. Its totient is φ = 2793600.

The previous prime is 2798849. The next prime is 2798867. The reversal of 2798857 is 7588972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1320201 + 1478656 = 1149^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 2798857 - 2³ = 2798849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2798837) 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, 1728 + ... + 2929.

It is an arithmetic number, because the mean of its divisors is an integer number (701029).

2^2798857 is an apocalyptic number.

It is an amenable number.

2798857 is a deficient number, since it is larger than the sum of its proper divisors (5259).

2798857 is an equidigital number, since it uses as much as digits as its factorization.

2798857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258.

The product of its digits is 282240, while the sum is 46.

The square root of 2798857 is about 1672.9784816309. The cubic root of 2798857 is about 140.9267933109.

It can be divided in two parts, 2798 and 857, that added together give a triangular number (3655 = T₈₅).

The spelling of 2798857 in words is "two million, seven hundred ninety-eight thousand, eight hundred fifty-seven".