84409856 has 40 divisors (see below), whose sum is σ = 177551880. Its totient is φ = 39979008.

The previous prime is 84409847. The next prime is 84409861. The reversal of 84409856 is 65890448.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5390 + ... + 14066.

It is an arithmetic number, because the mean of its divisors is an integer number (4438797).

Almost surely, 2^84409856 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 84409856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88775940).

84409856 is an abundant number, since it is smaller than the sum of its proper divisors (93142024).

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

84409856 is an equidigital number, since it uses as much as digits as its factorization.

84409856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8714 (or 8698 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 84409856 is about 9187.4836598494. The cubic root of 84409856 is about 438.6630491947.

The spelling of 84409856 in words is "eighty-four million, four hundred nine thousand, eight hundred fifty-six".