656212 has 12 divisors (see below), whose sum is σ = 1188180. Its totient is φ = 316736.

The previous prime is 656171. The next prime is 656221. The reversal of 656212 is 212656.

It can be written as a sum of positive squares in 2 ways, for example, as 188356 + 467856 = 434^2 + 684^2 .

It is a super-2 number, since 2×656212² = 861228377888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

656212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2713 + ... + 2944.

It is an arithmetic number, because the mean of its divisors is an integer number (99015).

2⁶⁵⁶²¹² is an apocalyptic number.

It is an amenable number.

656212 is a deficient number, since it is larger than the sum of its proper divisors (531968).

656212 is a wasteful number, since it uses less digits than its factorization.

656212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690 (or 5688 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 656212 is about 810.0691328523. The cubic root of 656212 is about 86.8989887690.

Adding to 656212 its reverse (212656), we get a palindrome (868868).

Subtracting from 656212 its reverse (212656), we obtain a square (443556 = 666²).

It can be divided in two parts, 656 and 212, that added together give a palindrome (868).

The spelling of 656212 in words is "six hundred fifty-six thousand, two hundred twelve".