857420 has 24 divisors (see below), whose sum is σ = 1844304. Its totient is φ = 334656.

The previous prime is 857419. The next prime is 857431. The reversal of 857420 is 24758.

It is a self number, because there is not a number n which added to its sum of digits gives 857420.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 857420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362 + ... + 1358.

It is an arithmetic number, because the mean of its divisors is an integer number (76846).

2⁸⁵⁷⁴²⁰ 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 857420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922152).

857420 is an abundant number, since it is smaller than the sum of its proper divisors (986884).

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

857420 is a wasteful number, since it uses less digits than its factorization.

857420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049 (or 1047 counting only the distinct ones).

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

The square root of 857420 is about 925.9697619253. The cubic root of 857420 is about 95.0016620208.

The spelling of 857420 in words is "eight hundred fifty-seven thousand, four hundred twenty".