2856689 has 6 divisors (see below), whose sum is σ = 3140130. Its totient is φ = 2596880.

The previous prime is 2856683. The next prime is 2856773. The reversal of 2856689 is 9866582.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1982464 + 874225 = 1408^2 + 935^2 .

It is not a de Polignac number, because 2856689 - 2⁴ = 2856673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2856683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11684 + ... + 11925.

It is an arithmetic number, because the mean of its divisors is an integer number (523355).

2^2856689 is an apocalyptic number.

It is an amenable number.

2856689 is a deficient number, since it is larger than the sum of its proper divisors (283441).

2856689 is a wasteful number, since it uses less digits than its factorization.

2856689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23631 (or 23620 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 2856689 is about 1690.1742513717. The cubic root of 2856689 is about 141.8908272820.

The spelling of 2856689 in words is "two million, eight hundred fifty-six thousand, six hundred eighty-nine".