851840043 has 4 divisors (see below), whose sum is σ = 1135786728. Its totient is φ = 567893360.

The previous prime is 851840023. The next prime is 851840071. The reversal of 851840043 is 340048158.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 851840043 - 2⁹ = 851839531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 851839986 and 851840013.

It is not an unprimeable number, because it can be changed into a prime (851840023) 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, 141973338 + ... + 141973343.

It is an arithmetic number, because the mean of its divisors is an integer number (283946682).

Almost surely, 2^851840043 is an apocalyptic number.

851840043 is a deficient number, since it is larger than the sum of its proper divisors (283946685).

851840043 is a wasteful number, since it uses less digits than its factorization.

851840043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283946684.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 851840043 is about 29186.2988917745. The cubic root of 851840043 is about 947.9512795646.

The spelling of 851840043 in words is "eight hundred fifty-one million, eight hundred forty thousand, forty-three".