647212 has 12 divisors (see below), whose sum is σ = 1139040. Its totient is φ = 321776.

The previous prime is 647209. The next prime is 647219. The reversal of 647212 is 212746.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (647219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618 + ... + 1294.

It is an arithmetic number, because the mean of its divisors is an integer number (94920).

2⁶⁴⁷²¹² is an apocalyptic number.

It is an amenable number.

647212 is a deficient number, since it is larger than the sum of its proper divisors (491828).

647212 is a wasteful number, since it uses less digits than its factorization.

647212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 918 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 647212 is about 804.4948725753. The cubic root of 647212 is about 86.4998830564.

Adding to 647212 its reverse (212746), we get a palindrome (859958).

The spelling of 647212 in words is "six hundred forty-seven thousand, two hundred twelve".