660386 has 8 divisors (see below), whose sum is σ = 1007004. Its totient is φ = 324720.

The previous prime is 660379. The next prime is 660391. The reversal of 660386 is 683066.

It can be written as a sum of positive squares in 2 ways, for example, as 534361 + 126025 = 731^2 + 355^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×660386² = 872219337992, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

660386 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 in 3 ways as a sum of consecutive naturals, for example, 2585 + ... + 2828.

2⁶⁶⁰³⁸⁶ is an apocalyptic number.

660386 is a deficient number, since it is larger than the sum of its proper divisors (346618).

660386 is a wasteful number, since it uses less digits than its factorization.

660386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 660386 is about 812.6413723162. The cubic root of 660386 is about 87.0828470526.

The spelling of 660386 in words is "six hundred sixty thousand, three hundred eighty-six".