643593 has 4 divisors (see below), whose sum is σ = 858128. Its totient is φ = 429060.

The previous prime is 643589. The next prime is 643619. The reversal of 643593 is 395346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 643593 - 2² = 643589 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 643593.

It is not an unprimeable number, because it can be changed into a prime (643523) 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, 107263 + ... + 107268.

It is an arithmetic number, because the mean of its divisors is an integer number (214532).

2⁶⁴³⁵⁹³ is an apocalyptic number.

It is an amenable number.

643593 is a deficient number, since it is larger than the sum of its proper divisors (214535).

643593 is a wasteful number, since it uses less digits than its factorization.

643593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214534.

The product of its digits is 9720, while the sum is 30.

The square root of 643593 is about 802.2424820464. The cubic root of 643593 is about 86.3383551621.

The spelling of 643593 in words is "six hundred forty-three thousand, five hundred ninety-three".