857240 has 32 divisors (see below), whose sum is σ = 1998000. Its totient is φ = 330624.

The previous prime is 857221. The next prime is 857249. The reversal of 857240 is 42758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857249) 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, 791 + ... + 1529.

2⁸⁵⁷²⁴⁰ 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 857240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999000).

857240 is an abundant number, since it is smaller than the sum of its proper divisors (1140760).

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

857240 is a wasteful number, since it uses less digits than its factorization.

857240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 857240 is about 925.8725614252. The cubic root of 857240 is about 94.9950135887.

Adding to 857240 its reverse (42758), we get a palindrome (899998).

The spelling of 857240 in words is "eight hundred fifty-seven thousand, two hundred forty".