659997 has 12 divisors (see below), whose sum is σ = 1026844. Its totient is φ = 406080.

The previous prime is 659983. The next prime is 659999. The reversal of 659997 is 799956.

It can be written as a sum of positive squares in 2 ways, for example, as 423801 + 236196 = 651^2 + 486^2 .

It is not a de Polignac number, because 659997 - 2⁸ = 659741 is a prime.

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 659997.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2704 + ... + 2937.

2⁶⁵⁹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

659997 is a deficient number, since it is larger than the sum of its proper divisors (366847).

659997 is a wasteful number, since it uses less digits than its factorization.

659997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5660 (or 5657 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 659997 is about 812.4019940891. The cubic root of 659997 is about 87.0657449935.

The spelling of 659997 in words is "six hundred fifty-nine thousand, nine hundred ninety-seven".