646212 has 48 divisors (see below), whose sum is σ = 1769600. Its totient is φ = 183456.

The previous prime is 646199. The next prime is 646237. The reversal of 646212 is 212646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646212.

It is an unprimeable number.

646212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4038 + ... + 4194.

2⁶⁴⁶²¹² 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 646212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884800).

646212 is an abundant number, since it is smaller than the sum of its proper divisors (1123388).

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

646212 is a wasteful number, since it uses less digits than its factorization.

646212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 169 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 646212 is about 803.8731243175. The cubic root of 646212 is about 86.4553100925.

Adding to 646212 its reverse (212646), we get a palindrome (858858).

It can be divided in two parts, 646 and 212, that added together give a palindrome (858).

The spelling of 646212 in words is "six hundred forty-six thousand, two hundred twelve".