851905964 has 72 divisors (see below), whose sum is σ = 1966048560. Its totient is φ = 319261824.

The previous prime is 851905963. The next prime is 851905979. The reversal of 851905964 is 469509158.

It is a happy number.

851905964 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (851905963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39614 + ... + 57210.

It is an arithmetic number, because the mean of its divisors is an integer number (27306230).

Almost surely, 2^851905964 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 851905964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983024280).

851905964 is an abundant number, since it is smaller than the sum of its proper divisors (1114142596).

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

851905964 is a wasteful number, since it uses less digits than its factorization.

851905964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17647 (or 17638 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 851905964 is about 29187.4281840658. The cubic root of 851905964 is about 947.9757318409.

The spelling of 851905964 in words is "eight hundred fifty-one million, nine hundred five thousand, nine hundred sixty-four".