840129643 has 8 divisors (see below), whose sum is σ = 847455200. Its totient is φ = 832835520.

The previous prime is 840129617. The next prime is 840129701. The reversal of 840129643 is 346921048.

840129643 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 a cyclic number.

It is not a de Polignac number, because 840129643 - 2⁹ = 840129131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840123643) 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, 47503 + ... + 62743.

It is an arithmetic number, because the mean of its divisors is an integer number (105931900).

Almost surely, 2^840129643 is an apocalyptic number.

840129643 is a deficient number, since it is larger than the sum of its proper divisors (7325557).

840129643 is a wasteful number, since it uses less digits than its factorization.

840129643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15717.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 840129643 is about 28984.9899603226. The cubic root of 840129643 is about 943.5873345187.

The spelling of 840129643 in words is "eight hundred forty million, one hundred twenty-nine thousand, six hundred forty-three".