840784854 has 64 divisors (see below), whose sum is σ = 2094672384. Its totient is φ = 219062016.

The previous prime is 840784853. The next prime is 840784859. The reversal of 840784854 is 458487048.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840784853) 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 31 ways as a sum of consecutive naturals, for example, 36042 + ... + 54594.

It is an arithmetic number, because the mean of its divisors is an integer number (32729256).

Almost surely, 2^840784854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840784854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1047336192).

840784854 is an abundant number, since it is smaller than the sum of its proper divisors (1253887530).

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

840784854 is a wasteful number, since it uses less digits than its factorization.

840784854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18661.

The product of its (nonzero) digits is 1146880, while the sum is 48.

The square root of 840784854 is about 28996.2903489395. The cubic root of 840784854 is about 943.8325697445.

The spelling of 840784854 in words is "eight hundred forty million, seven hundred eighty-four thousand, eight hundred fifty-four".