840523860 has 144 divisors (see below), whose sum is σ = 2945097792. Its totient is φ = 191769600.

The previous prime is 840523829. The next prime is 840523883. The reversal of 840523860 is 68325048.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21175 + ... + 46145.

It is an arithmetic number, because the mean of its divisors is an integer number (20452068).

Almost surely, 2^840523860 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 840523860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1472548896).

840523860 is an abundant number, since it is smaller than the sum of its proper divisors (2104573932).

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

840523860 is a wasteful number, since it uses less digits than its factorization.

840523860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25014 (or 25009 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 840523860 is about 28991.7895273817. The cubic root of 840523860 is about 943.7348990464.

The spelling of 840523860 in words is "eight hundred forty million, five hundred twenty-three thousand, eight hundred sixty".