840820344 has 128 divisors (see below), whose sum is σ = 2610800640. Its totient is φ = 219727872.

The previous prime is 840820327. The next prime is 840820367. The reversal of 840820344 is 443028048.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245089 + ... + 248495.

It is an arithmetic number, because the mean of its divisors is an integer number (20396880).

Almost surely, 2^840820344 is an apocalyptic number.

840820344 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840820344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1305400320).

840820344 is an abundant number, since it is smaller than the sum of its proper divisors (1769980296).

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

840820344 is a wasteful number, since it uses less digits than its factorization.

840820344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3549 (or 3545 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 33.

The square root of 840820344 is about 28996.9023173166. The cubic root of 840820344 is about 943.8458494583.

The spelling of 840820344 in words is "eight hundred forty million, eight hundred twenty thousand, three hundred forty-four".