859140820 has 48 divisors (see below), whose sum is σ = 1865622528. Its totient is φ = 331994880.

The previous prime is 859140811. The next prime is 859140881. The reversal of 859140820 is 28041958.

It is a self number, because there is not a number n which added to its sum of digits gives 859140820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598824 + ... + 600256.

It is an arithmetic number, because the mean of its divisors is an integer number (38867136).

Almost surely, 2^859140820 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 859140820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (932811264).

859140820 is an abundant number, since it is smaller than the sum of its proper divisors (1006481708).

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

859140820 is a wasteful number, since it uses less digits than its factorization.

859140820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440 (or 2438 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 859140820 is about 29311.1040392545. The cubic root of 859140820 is about 950.6517485175.

The spelling of 859140820 in words is "eight hundred fifty-nine million, one hundred forty thousand, eight hundred twenty".