659979 has 6 divisors (see below), whose sum is σ = 953316. Its totient is φ = 439980.

The previous prime is 659963. The next prime is 659983. The reversal of 659979 is 979956.

It is not a de Polignac number, because 659979 - 2⁴ = 659963 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 36657 + ... + 36674.

It is an arithmetic number, because the mean of its divisors is an integer number (158886).

2⁶⁵⁹⁹⁷⁹ is an apocalyptic number.

659979 is a deficient number, since it is larger than the sum of its proper divisors (293337).

659979 is a wasteful number, since it uses less digits than its factorization.

659979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73337 (or 73334 counting only the distinct ones).

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

The square root of 659979 is about 812.3909157542. The cubic root of 659979 is about 87.0649534760.

The spelling of 659979 in words is "six hundred fifty-nine thousand, nine hundred seventy-nine".