659998 has 4 divisors (see below), whose sum is σ = 990000. Its totient is φ = 329998.

The previous prime is 659983. The next prime is 659999. The reversal of 659998 is 899956.

It is a happy number.

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

It is a congruent number.

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

659998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164998 + ... + 165001.

It is an arithmetic number, because the mean of its divisors is an integer number (247500).

2⁶⁵⁹⁹⁹⁸ is an apocalyptic number.

659998 is a deficient number, since it is larger than the sum of its proper divisors (330002).

659998 is a wasteful number, since it uses less digits than its factorization.

659998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330001.

The product of its digits is 174960, while the sum is 46.

The square root of 659998 is about 812.4026095478. The cubic root of 659998 is about 87.0657889663.

The spelling of 659998 in words is "six hundred fifty-nine thousand, nine hundred ninety-eight".