851819406 has 16 divisors (see below), whose sum is σ = 1704665424. Its totient is φ = 283768704.

The previous prime is 851819393. The next prime is 851819429. The reversal of 851819406 is 604918158.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31771 + ... + 52086.

It is an arithmetic number, because the mean of its divisors is an integer number (106541589).

Almost surely, 2^851819406 is an apocalyptic number.

851819406 is an abundant number, since it is smaller than the sum of its proper divisors (852846018).

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

851819406 is a wasteful number, since it uses less digits than its factorization.

851819406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85555.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 851819406 is about 29185.9453504594. The cubic root of 851819406 is about 947.9436243603.

The spelling of 851819406 in words is "eight hundred fifty-one million, eight hundred nineteen thousand, four hundred six".