851981838 has 8 divisors (see below), whose sum is σ = 1703963688. Its totient is φ = 283993944.

The previous prime is 851981827. The next prime is 851981839. The reversal of 851981838 is 838189158.

It is a sphenic number, since it is the product of 3 distinct primes.

851981838 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851981839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70998481 + ... + 70998492.

It is an arithmetic number, because the mean of its divisors is an integer number (212995461).

Almost surely, 2^851981838 is an apocalyptic number.

851981838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

851981838 is a wasteful number, since it uses less digits than its factorization.

851981838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141996978.

The product of its digits is 552960, while the sum is 51.

The square root of 851981838 is about 29188.7279270612. The cubic root of 851981838 is about 948.0038744523.

The spelling of 851981838 in words is "eight hundred fifty-one million, nine hundred eighty-one thousand, eight hundred thirty-eight".