643007 has 4 divisors (see below), whose sum is σ = 656736. Its totient is φ = 629280.

The previous prime is 642997. The next prime is 643009. The reversal of 643007 is 700346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643007 - 2¹⁴ = 626623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643007.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643007.

It is not an unprimeable number, because it can be changed into a prime (643009) 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, 6794 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (164184).

2⁶⁴³⁰⁰⁷ is an apocalyptic number.

643007 is a deficient number, since it is larger than the sum of its proper divisors (13729).

643007 is a wasteful number, since it uses less digits than its factorization.

643007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13728.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 643007 is about 801.8771726393. The cubic root of 643007 is about 86.3121431308.

The spelling of 643007 in words is "six hundred forty-three thousand, seven".