646345 has 16 divisors (see below), whose sum is σ = 904320. Its totient is φ = 434304.

The previous prime is 646339. The next prime is 646379. The reversal of 646345 is 543646.

It is a cyclic number.

It is not a de Polignac number, because 646345 - 2⁹ = 645833 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 1909 + ... + 2221.

It is an arithmetic number, because the mean of its divisors is an integer number (56520).

2⁶⁴⁶³⁴⁵ is an apocalyptic number.

It is an amenable number.

646345 is a deficient number, since it is larger than the sum of its proper divisors (257975).

646345 is a wasteful number, since it uses less digits than its factorization.

646345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its digits is 8640, while the sum is 28.

The square root of 646345 is about 803.9558445586. The cubic root of 646345 is about 86.4612409467.

The spelling of 646345 in words is "six hundred forty-six thousand, three hundred forty-five".