851793820 has 24 divisors (see below), whose sum is σ = 1846470528. Its totient is φ = 329726400.

The previous prime is 851793791. The next prime is 851793863. The reversal of 851793820 is 28397158.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 686311 + ... + 687550.

It is an arithmetic number, because the mean of its divisors is an integer number (76936272).

Almost surely, 2^851793820 is an apocalyptic number.

It is an amenable number.

851793820 is an abundant number, since it is smaller than the sum of its proper divisors (994676708).

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

851793820 is a wasteful number, since it uses less digits than its factorization.

851793820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373901 (or 1373899 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 851793820 is about 29185.5070197521. The cubic root of 851793820 is about 947.9341331746.

The spelling of 851793820 in words is "eight hundred fifty-one million, seven hundred ninety-three thousand, eight hundred twenty".