857172 has 24 divisors (see below), whose sum is σ = 2034592. Its totient is φ = 280800.

The previous prime is 857167. The next prime is 857201. The reversal of 857172 is 271758.

It is a happy number.

It is a d-powerful number, because it can be written as 8³ + 5 + 1 + 7³ + 7⁷ + 2¹⁵ .

It is a congruent number.

It is an unprimeable number.

857172 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 in 7 ways as a sum of consecutive naturals, for example, 147 + ... + 1317.

2⁸⁵⁷¹⁷² is an apocalyptic number.

It is an amenable number.

857172 is an abundant number, since it is smaller than the sum of its proper divisors (1177420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857172 is a wasteful number, since it uses less digits than its factorization.

857172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239 (or 1237 counting only the distinct ones).

The product of its digits is 3920, while the sum is 30.

The square root of 857172 is about 925.8358385805. The cubic root of 857172 is about 94.9925017166.

The spelling of 857172 in words is "eight hundred fifty-seven thousand, one hundred seventy-two".