851890986 has 64 divisors (see below), whose sum is σ = 1942911360. Its totient is φ = 276583680.

The previous prime is 851890913. The next prime is 851890987. The reversal of 851890986 is 689098158.

851890986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (851890987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351250 + ... + 353666.

It is an arithmetic number, because the mean of its divisors is an integer number (30357990).

Almost surely, 2^851890986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851890986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971455680).

851890986 is an abundant number, since it is smaller than the sum of its proper divisors (1091020374).

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

851890986 is a wasteful number, since it uses less digits than its factorization.

851890986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596 (or 2590 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The square root of 851890986 is about 29187.1715998656. The cubic root of 851890986 is about 947.9701761167.

The spelling of 851890986 in words is "eight hundred fifty-one million, eight hundred ninety thousand, nine hundred eighty-six".