646312 has 8 divisors (see below), whose sum is σ = 1211850. Its totient is φ = 323152.

The previous prime is 646309. The next prime is 646339. The reversal of 646312 is 213646.

646312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 630436 + 15876 = 794^2 + 126^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40387 + ... + 40402.

2⁶⁴⁶³¹² is an apocalyptic number.

It is an amenable number.

646312 is a deficient number, since it is larger than the sum of its proper divisors (565538).

646312 is a wasteful number, since it uses less digits than its factorization.

646312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80795 (or 80791 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 646312 is about 803.9353207815. The cubic root of 646312 is about 86.4597694573.

Adding to 646312 its reverse (213646), we get a palindrome (859958).

The spelling of 646312 in words is "six hundred forty-six thousand, three hundred twelve".