840385039 has 16 divisors (see below), whose sum is σ = 920614464. Its totient is φ = 762451200.

The previous prime is 840385031. The next prime is 840385061. The reversal of 840385039 is 930583048.

It is a cyclic number.

It is not a de Polignac number, because 840385039 - 2³ = 840385031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840384992 and 840385010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840385031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343059 + ... + 345499.

It is an arithmetic number, because the mean of its divisors is an integer number (57538404).

Almost surely, 2^840385039 is an apocalyptic number.

840385039 is a deficient number, since it is larger than the sum of its proper divisors (80229425).

840385039 is a wasteful number, since it uses less digits than its factorization.

840385039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 840385039 is about 28989.3952851728. The cubic root of 840385039 is about 943.6829404042.

The spelling of 840385039 in words is "eight hundred forty million, three hundred eighty-five thousand, thirty-nine".