856290 has 64 divisors (see below), whose sum is σ = 2301696. Its totient is φ = 202752.

The previous prime is 856279. The next prime is 856301. The reversal of 856290 is 92658.

It is an interprime number because it is at equal distance from previous prime (856279) and next prime (856301).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

856290 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 31 ways as a sum of consecutive naturals, for example, 11694 + ... + 11766.

It is an arithmetic number, because the mean of its divisors is an integer number (35964).

2⁸⁵⁶²⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1150848).

856290 is an abundant number, since it is smaller than the sum of its proper divisors (1445406).

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

856290 is a wasteful number, since it uses less digits than its factorization.

856290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 856290 is about 925.3593896427. The cubic root of 856290 is about 94.9599092149.

The spelling of 856290 in words is "eight hundred fifty-six thousand, two hundred ninety".