840240559 has 4 divisors (see below), whose sum is σ = 840332416. Its totient is φ = 840148704.

The previous prime is 840240551. The next prime is 840240571. The reversal of 840240559 is 955042048.

840240559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 840240559 - 2³ = 840240551 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 (840240551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30474 + ... + 51079.

It is an arithmetic number, because the mean of its divisors is an integer number (210083104).

Almost surely, 2^840240559 is an apocalyptic number.

840240559 is a deficient number, since it is larger than the sum of its proper divisors (91857).

840240559 is a wasteful number, since it uses less digits than its factorization.

840240559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91856.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 840240559 is about 28986.9032323220. The cubic root of 840240559 is about 943.6288576052.

The spelling of 840240559 in words is "eight hundred forty million, two hundred forty thousand, five hundred fifty-nine".