840999043600 has 45 divisors (see below), whose sum is σ = 2020544267943. Its totient is φ = 336392280960.

The previous prime is 840999043589. The next prime is 840999043603. The reversal of 840999043600 is 6340999048.

The square root of 840999043600 is 917060.

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

It can be written as a sum of positive squares in 4 ways, for example, as 151062814224 + 689936229376 = 388668^2 + 830624^2 .

It is a super-2 number, since 2×840999043600² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840999043603) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 18318274 + ... + 18364126.

Almost surely, 2^840999043600 is an apocalyptic number.

840999043600 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

840999043600 is the 917060-th square number.

It is an amenable number.

840999043600 is an abundant number, since it is smaller than the sum of its proper divisors (1179545224343).

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

840999043600 is an frugal number, since it uses more digits than its factorization.

840999043600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91724 (or 45860 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 840999043600 in words is "eight hundred forty billion, nine hundred ninety-nine million, forty-three thousand, six hundred".