857972 has 12 divisors (see below), whose sum is σ = 1510656. Its totient is φ = 426360.

The previous prime is 857963. The next prime is 857977. The reversal of 857972 is 279758.

It is a super-2 number, since 2×857972² = 1472231905568, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857977) 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 3 ways as a sum of consecutive naturals, for example, 203 + ... + 1325.

It is an arithmetic number, because the mean of its divisors is an integer number (125888).

2⁸⁵⁷⁹⁷² is an apocalyptic number.

It is an amenable number.

857972 is a deficient number, since it is larger than the sum of its proper divisors (652684).

857972 is a wasteful number, since it uses less digits than its factorization.

857972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 1316 counting only the distinct ones).

The product of its digits is 35280, while the sum is 38.

The square root of 857972 is about 926.2677798563. The cubic root of 857972 is about 95.0220447456.

The spelling of 857972 in words is "eight hundred fifty-seven thousand, nine hundred seventy-two".