857940 has 48 divisors (see below), whose sum is σ = 2446080. Its totient is φ = 224640.

The previous prime is 857929. The next prime is 857951. The reversal of 857940 is 49758.

857940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (857929) and next prime (857951).

It is a super-2 number, since 2×857940² = 1472122087200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

857940 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 15 ways as a sum of consecutive naturals, for example, 4650 + ... + 4830.

It is an arithmetic number, because the mean of its divisors is an integer number (50960).

2⁸⁵⁷⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1223040).

857940 is an abundant number, since it is smaller than the sum of its proper divisors (1588140).

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

857940 is a wasteful number, since it uses less digits than its factorization.

857940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 857940 is about 926.2505060727. The cubic root of 857940 is about 95.0208633771.

The spelling of 857940 in words is "eight hundred fifty-seven thousand, nine hundred forty".