857872 has 10 divisors (see below), whose sum is σ = 1662158. Its totient is φ = 428928.

The previous prime is 857867. The next prime is 857873. The reversal of 857872 is 278758.

It can be written as a sum of positive squares in only one way, i.e., 853776 + 4096 = 924^2 + 64^2 .

It is not an unprimeable number, because it can be changed into a prime (857873) by changing a digit.

857872 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26793 + ... + 26824.

2⁸⁵⁷⁸⁷² is an apocalyptic number.

It is an amenable number.

857872 is a deficient number, since it is larger than the sum of its proper divisors (804286).

857872 is a wasteful number, since it uses less digits than its factorization.

857872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53625 (or 53619 counting only the distinct ones).

The product of its digits is 31360, while the sum is 37.

The square root of 857872 is about 926.2137982129. The cubic root of 857872 is about 95.0183528716.

The spelling of 857872 in words is "eight hundred fifty-seven thousand, eight hundred seventy-two".