659986 has 4 divisors (see below), whose sum is σ = 989982. Its totient is φ = 329992.

The previous prime is 659983. The next prime is 659999. The reversal of 659986 is 689956.

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

It can be written as a sum of positive squares in only one way, i.e., 390625 + 269361 = 625^2 + 519^2 .

It is not an unprimeable number, because it can be changed into a prime (659983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164995 + ... + 164998.

2⁶⁵⁹⁹⁸⁶ is an apocalyptic number.

659986 is a deficient number, since it is larger than the sum of its proper divisors (329996).

659986 is a wasteful number, since it uses less digits than its factorization.

659986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329995.

The product of its digits is 116640, while the sum is 43.

The square root of 659986 is about 812.3952240135. The cubic root of 659986 is about 87.0652612901.

The spelling of 659986 in words is "six hundred fifty-nine thousand, nine hundred eighty-six".