2856789 has 20 divisors (see below), whose sum is σ = 4597516. Its totient is φ = 1757376.

The previous prime is 2856779. The next prime is 2856803. The reversal of 2856789 is 9876582.

2856789 is a `hidden beast` number, since 2 + 8 + 567 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1822500 + 1034289 = 1350^2 + 1017^2 .

It is not a de Polignac number, because 2856789 - 2⁴ = 2856773 is a prime.

It is a super-2 number, since 2×2856789² = 16322486781042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2856779) 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 19 ways as a sum of consecutive naturals, for example, 304 + ... + 2409.

2^2856789 is an apocalyptic number.

It is an amenable number.

2856789 is a deficient number, since it is larger than the sum of its proper divisors (1740727).

2856789 is a wasteful number, since it uses less digits than its factorization.

2856789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738 (or 2729 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 2856789 is about 1690.2038338615. The cubic root of 2856789 is about 141.8924829187.

The spelling of 2856789 in words is "two million, eight hundred fifty-six thousand, seven hundred eighty-nine".