840239012640 has 96 divisors (see below), whose sum is σ = 2647160429760. Its totient is φ = 224029236224.

The previous prime is 840239012629. The next prime is 840239012663. The reversal of 840239012640 is 46210932048.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3064882 + ... + 3327758.

It is an arithmetic number, because the mean of its divisors is an integer number (27574587810).

Almost surely, 2^840239012640 is an apocalyptic number.

840239012640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

840239012640 is an abundant number, since it is smaller than the sum of its proper divisors (1806921417120).

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

840239012640 is a wasteful number, since it uses less digits than its factorization.

840239012640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269554 (or 269546 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

Adding to 840239012640 its reverse (46210932048), we get a palindrome (886449944688).

The spelling of 840239012640 in words is "eight hundred forty billion, two hundred thirty-nine million, twelve thousand, six hundred forty".