643207 has 8 divisors (see below), whose sum is σ = 686000. Its totient is φ = 601344.

The previous prime is 643199. The next prime is 643213. The reversal of 643207 is 702346.

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

It is a cyclic number.

It is not a de Polignac number, because 643207 - 2³ = 643199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1669 + ... + 2017.

It is an arithmetic number, because the mean of its divisors is an integer number (85750).

2⁶⁴³²⁰⁷ is an apocalyptic number.

643207 is a deficient number, since it is larger than the sum of its proper divisors (42793).

643207 is a wasteful number, since it uses less digits than its factorization.

643207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 643207 is about 802.0018703220. The cubic root of 643207 is about 86.3210910060.

The spelling of 643207 in words is "six hundred forty-three thousand, two hundred seven".