646994 has 8 divisors (see below), whose sum is σ = 987120. Its totient is φ = 317956.

The previous prime is 646993. The next prime is 647011. The reversal of 646994 is 499646.

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

It is not an unprimeable number, because it can be changed into a prime (646991) 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, 2624 + ... + 2859.

It is an arithmetic number, because the mean of its divisors is an integer number (123390).

2⁶⁴⁶⁹⁹⁴ is an apocalyptic number.

646994 is a deficient number, since it is larger than the sum of its proper divisors (340126).

646994 is a wasteful number, since it uses less digits than its factorization.

646994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544.

The product of its digits is 46656, while the sum is 38.

The square root of 646994 is about 804.3593724201. The cubic root of 646994 is about 86.4901700659.

The spelling of 646994 in words is "six hundred forty-six thousand, nine hundred ninety-four".