646930 has 8 divisors (see below), whose sum is σ = 1164492. Its totient is φ = 258768.

The previous prime is 646927. The next prime is 646937. The reversal of 646930 is 39646.

It can be written as a sum of positive squares in 2 ways, for example, as 641601 + 5329 = 801^2 + 73^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam 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, 32337 + ... + 32356.

2⁶⁴⁶⁹³⁰ is an apocalyptic number.

646930 is a deficient number, since it is larger than the sum of its proper divisors (517562).

646930 is a wasteful number, since it uses less digits than its factorization.

646930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64700.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 646930 is about 804.3195882235. The cubic root of 646930 is about 86.4873181314.

The spelling of 646930 in words is "six hundred forty-six thousand, nine hundred thirty".