840075643 has 8 divisors (see below), whose sum is σ = 923137200. Its totient is φ = 758129280.

The previous prime is 840075641. The next prime is 840075653. The reversal of 840075643 is 346570048.

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 840075643 - 2¹ = 840075641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840075641) 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, 277218 + ... + 280231.

It is an arithmetic number, because the mean of its divisors is an integer number (115392150).

Almost surely, 2^840075643 is an apocalyptic number.

840075643 is a deficient number, since it is larger than the sum of its proper divisors (83061557).

840075643 is a wasteful number, since it uses less digits than its factorization.

840075643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557597.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 840075643 is about 28984.0584287294. The cubic root of 840075643 is about 943.5671174771.

The spelling of 840075643 in words is "eight hundred forty million, seventy-five thousand, six hundred forty-three".