840849249408 has 128 divisors (see below), whose sum is σ = 2553299773440. Its totient is φ = 240174720000.

The previous prime is 840849249403. The next prime is 840849249419. The reversal of 840849249408 is 804942948048.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (840849249403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9879033 + ... + 9963783.

It is an arithmetic number, because the mean of its divisors is an integer number (19947654480).

Almost surely, 2^840849249408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840849249408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276649886720).

840849249408 is an abundant number, since it is smaller than the sum of its proper divisors (1712450524032).

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

840849249408 is a wasteful number, since it uses less digits than its factorization.

840849249408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88466 (or 88454 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 60.

The spelling of 840849249408 in words is "eight hundred forty billion, eight hundred forty-nine million, two hundred forty-nine thousand, four hundred eight".