646384 has 20 divisors (see below), whose sum is σ = 1272240. Its totient is φ = 318080.

The previous prime is 646379. The next prime is 646397. The reversal of 646384 is 483646.

It is a congruent number.

It is an unprimeable number.

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, 852 + ... + 1420.

It is an arithmetic number, because the mean of its divisors is an integer number (63612).

2⁶⁴⁶³⁸⁴ is an apocalyptic number.

It is an amenable number.

646384 is a deficient number, since it is larger than the sum of its proper divisors (625856).

646384 is a wasteful number, since it uses less digits than its factorization.

646384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 642 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 646384 is about 803.9800992562. The cubic root of 646384 is about 86.4629799151.

The spelling of 646384 in words is "six hundred forty-six thousand, three hundred eighty-four".