840120013 has 4 divisors (see below), whose sum is σ = 855971388. Its totient is φ = 824268640.

The previous prime is 840119983. The next prime is 840120097. The reversal of 840120013 is 310021048.

840120013 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.

It can be written as a sum of positive squares in 2 ways, for example, as 338449609 + 501670404 = 18397^2 + 22398^2 .

It is a cyclic number.

It is not a de Polignac number, because 840120013 - 2⁵ = 840119981 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 (840120313) 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, 7925608 + ... + 7925713.

It is an arithmetic number, because the mean of its divisors is an integer number (213992847).

Almost surely, 2^840120013 is an apocalyptic number.

It is an amenable number.

840120013 is a deficient number, since it is larger than the sum of its proper divisors (15851375).

840120013 is a wasteful number, since it uses less digits than its factorization.

840120013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15851374.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 840120013 is about 28984.8238393819. The cubic root of 840120013 is about 943.5837292098.

The spelling of 840120013 in words is "eight hundred forty million, one hundred twenty thousand, thirteen".