2856939 has 4 divisors (see below), whose sum is σ = 3809256. Its totient is φ = 1904624.

The previous prime is 2856923. The next prime is 2856961. The reversal of 2856939 is 9396582.

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

It is a cyclic number.

It is not a de Polignac number, because 2856939 - 2⁴ = 2856923 is a prime.

It is a D-number.

2856939 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2856939.

It is not an unprimeable number, because it can be changed into a prime (2851939) 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, 476154 + ... + 476159.

It is an arithmetic number, because the mean of its divisors is an integer number (952314).

2^2856939 is an apocalyptic number.

2856939 is a deficient number, since it is larger than the sum of its proper divisors (952317).

2856939 is an equidigital number, since it uses as much as digits as its factorization.

2856939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952316.

The product of its digits is 116640, while the sum is 42.

The square root of 2856939 is about 1690.2482066253. The cubic root of 2856939 is about 141.8949663012.

The spelling of 2856939 in words is "two million, eight hundred fifty-six thousand, nine hundred thirty-nine".