2856891 has 4 divisors (see below), whose sum is σ = 3809192. Its totient is φ = 1904592.

The previous prime is 2856883. The next prime is 2856923. The reversal of 2856891 is 1986582.

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

It is not a de Polignac number, because 2856891 - 2³ = 2856883 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2856871) 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, 476146 + ... + 476151.

It is an arithmetic number, because the mean of its divisors is an integer number (952298).

2^2856891 is an apocalyptic number.

2856891 is a deficient number, since it is larger than the sum of its proper divisors (952301).

2856891 is an equidigital number, since it uses as much as digits as its factorization.

2856891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952300.

The product of its digits is 34560, while the sum is 39.

The square root of 2856891 is about 1690.2340074676. The cubic root of 2856891 is about 141.8941716283.

The spelling of 2856891 in words is "two million, eight hundred fifty-six thousand, eight hundred ninety-one".