856890 has 24 divisors (see below), whose sum is σ = 2228148. Its totient is φ = 228480.

The previous prime is 856853. The next prime is 856897. The reversal of 856890 is 98658.

856890 is a `hidden beast` number, since 8 + 568 + 90 = 666.

856890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 848241 + 8649 = 921^2 + 93^2 .

It is not an unprimeable number, because it can be changed into a prime (856897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4671 + ... + 4850.

2⁸⁵⁶⁸⁹⁰ is an apocalyptic number.

856890 is an abundant number, since it is smaller than the sum of its proper divisors (1371258).

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

856890 is a wasteful number, since it uses less digits than its factorization.

856890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9534 (or 9531 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 856890 is about 925.6835312352. The cubic root of 856890 is about 94.9820834172.

The spelling of 856890 in words is "eight hundred fifty-six thousand, eight hundred ninety".