840199557376 has 81 divisors (see below), whose sum is σ = 1707783376663. Its totient is φ = 412554129920.

The previous prime is 840199557359. The next prime is 840199557389. The reversal of 840199557376 is 673755991048.

The square root of 840199557376 is 916624.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 865292571 + ... + 865293541.

Almost surely, 2^840199557376 is an apocalyptic number.

840199557376 is the 916624-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840199557376

840199557376 is an abundant number, since it is smaller than the sum of its proper divisors (867583819287).

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

840199557376 is an frugal number, since it uses more digits than its factorization.

840199557376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076 (or 1032 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 64.

Multiplying 840199557376 by its sum of digits (64), we get a square (53772771672064 = 7332992²).

840199557376 divided by its sum of digits (64) gives a square (13128118084 = 114578²).

The spelling of 840199557376 in words is "eight hundred forty billion, one hundred ninety-nine million, five hundred fifty-seven thousand, three hundred seventy-six".