656384 has 22 divisors (see below), whose sum is σ = 1314174. Its totient is φ = 327680.

The previous prime is 656377. The next prime is 656389. The reversal of 656384 is 483656.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 16384 = 800^2 + 128^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 656384.

It is not an unprimeable number, because it can be changed into a prime (656389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 704 + ... + 1344.

2⁶⁵⁶³⁸⁴ is an apocalyptic number.

656384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (657087).

656384 is an abundant number, since it is smaller than the sum of its proper divisors (657790).

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

656384 is an equidigital number, since it uses as much as digits as its factorization.

656384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 643 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 656384 is about 810.1752896750. The cubic root of 656384 is about 86.9065804824.

The spelling of 656384 in words is "six hundred fifty-six thousand, three hundred eighty-four".