659993 has 4 divisors (see below), whose sum is σ = 669108. Its totient is φ = 650880.

The previous prime is 659983. The next prime is 659999. The reversal of 659993 is 399956.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 559504 + 100489 = 748^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 659993 - 2¹⁰ = 658969 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 659993.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 659993.

It is not an unprimeable number, because it can be changed into a prime (659999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4448 + ... + 4593.

It is an arithmetic number, because the mean of its divisors is an integer number (167277).

2⁶⁵⁹⁹⁹³ is an apocalyptic number.

It is an amenable number.

659993 is a deficient number, since it is larger than the sum of its proper divisors (9115).

659993 is an equidigital number, since it uses as much as digits as its factorization.

659993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9114.

The product of its digits is 65610, while the sum is 41.

The square root of 659993 is about 812.3995322500. The cubic root of 659993 is about 87.0655691020.

The spelling of 659993 in words is "six hundred fifty-nine thousand, nine hundred ninety-three".