840729344 has 144 divisors (see below), whose sum is σ = 2087823360. Its totient is φ = 329011200.

The previous prime is 840729341. The next prime is 840729349. The reversal of 840729344 is 443927048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840729341) 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, 3517577 + ... + 3517815.

Almost surely, 2^840729344 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 840729344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1043911680).

840729344 is an abundant number, since it is smaller than the sum of its proper divisors (1247094016).

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

840729344 is a wasteful number, since it uses less digits than its factorization.

840729344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 840729344 is about 28995.3331417316. Note that the first 3 decimals coincide. The cubic root of 840729344 is about 943.8117981608.

The spelling of 840729344 in words is "eight hundred forty million, seven hundred twenty-nine thousand, three hundred forty-four".