404784856 has 64 divisors (see below), whose sum is σ = 899112960. Its totient is φ = 167184000.

The previous prime is 404784839. The next prime is 404784857. The reversal of 404784856 is 658487404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404784857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 747946 + ... + 748486.

It is an arithmetic number, because the mean of its divisors is an integer number (14048640).

Almost surely, 2^404784856 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 404784856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449556480).

404784856 is an abundant number, since it is smaller than the sum of its proper divisors (494328104).

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

404784856 is a wasteful number, since it uses less digits than its factorization.

404784856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 46.

The square root of 404784856 is about 20119.2657917728. The cubic root of 404784856 is about 739.7325890370.

The spelling of 404784856 in words is "four hundred four million, seven hundred eighty-four thousand, eight hundred fifty-six".