656424 has 40 divisors (see below), whose sum is σ = 1840410. Its totient is φ = 218592.

The previous prime is 656423. The next prime is 656429. The reversal of 656424 is 424656.

It is a happy number.

656424 is a `hidden beast` number, since 656 + 4 + 2 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 324 = 810^2 + 18^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 656424.

It is not an unprimeable number, because it can be changed into a prime (656423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 142 + ... + 1154.

656424 is a Friedman number, since it can be written as 6+42*(5^6+4), using all its digits and the basic arithmetic operations.

2⁶⁵⁶⁴²⁴ 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 656424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (920205).

656424 is an abundant number, since it is smaller than the sum of its proper divisors (1183986).

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

656424 is a wasteful number, since it uses less digits than its factorization.

656424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031 (or 1018 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 656424 is about 810.1999753147. The cubic root of 656424 is about 86.9083458071.

The spelling of 656424 in words is "six hundred fifty-six thousand, four hundred twenty-four".