857939 has 8 divisors (see below), whose sum is σ = 918720. Its totient is φ = 798336.

The previous prime is 857929. The next prime is 857951. The reversal of 857939 is 939758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 857939 - 2¹² = 853843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 857896 and 857905.

It is not an unprimeable number, because it can be changed into a prime (857929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1622 + ... + 2084.

It is an arithmetic number, because the mean of its divisors is an integer number (114840).

2⁸⁵⁷⁹³⁹ is an apocalyptic number.

857939 is a deficient number, since it is larger than the sum of its proper divisors (60781).

857939 is a wasteful number, since it uses less digits than its factorization.

857939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589.

The product of its digits is 68040, while the sum is 41.

The square root of 857939 is about 926.2499662618. The cubic root of 857939 is about 95.0208264589.

The spelling of 857939 in words is "eight hundred fifty-seven thousand, nine hundred thirty-nine".