840142039 has 4 divisors (see below), whose sum is σ = 916518600. Its totient is φ = 763765480.

The previous prime is 840142027. The next prime is 840142087. The reversal of 840142039 is 930241048.

840142039 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 is a cyclic number.

It is not a de Polignac number, because 840142039 - 2⁹ = 840141527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840142039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840142099) 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, 38188264 + ... + 38188285.

It is an arithmetic number, because the mean of its divisors is an integer number (229129650).

Almost surely, 2^840142039 is an apocalyptic number.

840142039 is a deficient number, since it is larger than the sum of its proper divisors (76376561).

840142039 is a wasteful number, since it uses less digits than its factorization.

840142039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76376560.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 840142039 is about 28985.2037943500. The cubic root of 840142039 is about 943.5919753307.

Subtracting 840142039 from its reverse (930241048), we obtain a palindrome (90099009).

The spelling of 840142039 in words is "eight hundred forty million, one hundred forty-two thousand, thirty-nine".