857139 has 8 divisors (see below), whose sum is σ = 1167360. Its totient is φ = 559176.

The previous prime is 857137. The next prime is 857161. The reversal of 857139 is 931758.

857139 = T₁₆₇ + T₁₆₈ + ... + T₂₁₃.

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

It is not a de Polignac number, because 857139 - 2¹ = 857137 is a prime.

857139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (857137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2899 + ... + 3180.

It is an arithmetic number, because the mean of its divisors is an integer number (145920).

2⁸⁵⁷¹³⁹ is an apocalyptic number.

857139 is a deficient number, since it is larger than the sum of its proper divisors (310221).

857139 is a wasteful number, since it uses less digits than its factorization.

857139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6129.

The product of its digits is 7560, while the sum is 33.

The square root of 857139 is about 925.8180166750. The cubic root of 857139 is about 94.9912826719.

The spelling of 857139 in words is "eight hundred fifty-seven thousand, one hundred thirty-nine".