2856869 has 4 divisors (see below), whose sum is σ = 2874144. Its totient is φ = 2839596.

The previous prime is 2856863. The next prime is 2856871. The reversal of 2856869 is 9686582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2856869 - 2²⁰ = 1808293 is a prime.

It is a super-2 number, since 2×2856869² = 16323400966322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2856863) 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 3 ways as a sum of consecutive naturals, for example, 8387 + ... + 8720.

It is an arithmetic number, because the mean of its divisors is an integer number (718536).

2^2856869 is an apocalyptic number.

It is an amenable number.

2856869 is a deficient number, since it is larger than the sum of its proper divisors (17275).

2856869 is a wasteful number, since it uses less digits than its factorization.

2856869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17274.

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

The square root of 2856869 is about 1690.2274994805. The cubic root of 2856869 is about 141.8938074002.

The spelling of 2856869 in words is "two million, eight hundred fifty-six thousand, eight hundred sixty-nine".