869857 has 4 divisors (see below), whose sum is σ = 872640. Its totient is φ = 867076.

The previous prime is 869849. The next prime is 869863. The reversal of 869857 is 758968.

It is a happy number.

869857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 869857 - 2³ = 869849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869807) 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, 853 + ... + 1570.

It is an arithmetic number, because the mean of its divisors is an integer number (218160).

2⁸⁶⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

869857 is a deficient number, since it is larger than the sum of its proper divisors (2783).

869857 is a wasteful number, since it uses less digits than its factorization.

869857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782.

The product of its digits is 120960, while the sum is 43.

The square root of 869857 is about 932.6612461124. The cubic root of 869857 is about 95.4587964025.

Subtracting from 869857 its reverse (758968), we obtain a square (110889 = 333²).

The spelling of 869857 in words is "eight hundred sixty-nine thousand, eight hundred fifty-seven".