659990 has 16 divisors (see below), whose sum is σ = 1226880. Its totient is φ = 255360.

The previous prime is 659983. The next prime is 659999. The reversal of 659990 is 99956.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 755 + ... + 1374.

It is an arithmetic number, because the mean of its divisors is an integer number (76680).

2⁶⁵⁹⁹⁹⁰ is an apocalyptic number.

659990 is a deficient number, since it is larger than the sum of its proper divisors (566890).

659990 is a wasteful number, since it uses less digits than its factorization.

659990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 659990 is about 812.3976858657. The cubic root of 659990 is about 87.0654371829.

The spelling of 659990 in words is "six hundred fifty-nine thousand, nine hundred ninety".