659779 has 4 divisors (see below), whose sum is σ = 682560. Its totient is φ = 637000.

The previous prime is 659761. The next prime is 659783. The reversal of 659779 is 977956.

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

It is a cyclic number.

It is not a de Polignac number, because 659779 - 2¹³ = 651587 is a prime.

It is a Duffinian number.

659779 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (659759) 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, 11347 + ... + 11404.

It is an arithmetic number, because the mean of its divisors is an integer number (170640).

2⁶⁵⁹⁷⁷⁹ is an apocalyptic number.

659779 is a deficient number, since it is larger than the sum of its proper divisors (22781).

659779 is a wasteful number, since it uses less digits than its factorization.

659779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22780.

The product of its digits is 119070, while the sum is 43.

The square root of 659779 is about 812.2678129780. The cubic root of 659779 is about 87.0561578679.

The spelling of 659779 in words is "six hundred fifty-nine thousand, seven hundred seventy-nine".