840040520 has 32 divisors (see below), whose sum is σ = 2061918720. Its totient is φ = 305469120.

The previous prime is 840040519. The next prime is 840040529. The reversal of 840040520 is 25040048.

It is not an unprimeable number, because it can be changed into a prime (840040529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954152 + ... + 955031.

It is an arithmetic number, because the mean of its divisors is an integer number (64434960).

Almost surely, 2^840040520 is an apocalyptic number.

It is an amenable number.

840040520 is an abundant number, since it is smaller than the sum of its proper divisors (1221878200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840040520 is a wasteful number, since it uses less digits than its factorization.

840040520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909205 (or 1909201 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 840040520 is about 28983.4525203606. The cubic root of 840040520 is about 943.5539673241.

Adding to 840040520 its reverse (25040048), we get a palindrome (865080568).

The spelling of 840040520 in words is "eight hundred forty million, forty thousand, five hundred twenty".