646936 has 16 divisors (see below), whose sum is σ = 1222200. Its totient is φ = 321024.

The previous prime is 646927. The next prime is 646937. The reversal of 646936 is 639646.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1335 + ... + 1753.

2⁶⁴⁶⁹³⁶ is an apocalyptic number.

It is an amenable number.

646936 is a deficient number, since it is larger than the sum of its proper divisors (575264).

646936 is a wasteful number, since it uses less digits than its factorization.

646936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 614 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The square root of 646936 is about 804.3233180755. The cubic root of 646936 is about 86.4875855083.

The spelling of 646936 in words is "six hundred forty-six thousand, nine hundred thirty-six".