840081047 has 8 divisors (see below), whose sum is σ = 905286144. Its totient is φ = 774959328.

The previous prime is 840081043. The next prime is 840081071. The reversal of 840081047 is 740180048.

840081047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 840081047 - 2² = 840081043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840081043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 938 + ... + 41000.

It is an arithmetic number, because the mean of its divisors is an integer number (113160768).

Almost surely, 2^840081047 is an apocalyptic number.

840081047 is a deficient number, since it is larger than the sum of its proper divisors (65205097).

840081047 is a wasteful number, since it uses less digits than its factorization.

840081047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41689.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 840081047 is about 28984.1516522392. The cubic root of 840081047 is about 943.5691407179.

Subtracting from 840081047 its reverse (740180048), we obtain a palindrome (99900999).

The spelling of 840081047 in words is "eight hundred forty million, eighty-one thousand, forty-seven".