660383 has 4 divisors (see below), whose sum is σ = 695160. Its totient is φ = 625608.

The previous prime is 660379. The next prime is 660391. The reversal of 660383 is 383066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 383066 = 2 ⋅191533.

It is a cyclic number.

It is not a de Polignac number, because 660383 - 2² = 660379 is a prime.

It is a super-2 number, since 2×660383² = 872211413378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17360 + ... + 17397.

It is an arithmetic number, because the mean of its divisors is an integer number (173790).

2⁶⁶⁰³⁸³ is an apocalyptic number.

660383 is a deficient number, since it is larger than the sum of its proper divisors (34777).

660383 is a wasteful number, since it uses less digits than its factorization.

660383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34776.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 660383 is about 812.6395264815. The cubic root of 660383 is about 87.0827151858.

The spelling of 660383 in words is "six hundred sixty thousand, three hundred eighty-three".