660043 has 4 divisors (see below), whose sum is σ = 677920. Its totient is φ = 642168.

The previous prime is 660029. The next prime is 660047. The reversal of 660043 is 340066.

It is a happy number.

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 660043 - 2⁹ = 659531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660043.

It is not an unprimeable number, because it can be changed into a prime (660047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8883 + ... + 8956.

It is an arithmetic number, because the mean of its divisors is an integer number (169480).

2⁶⁶⁰⁰⁴³ is an apocalyptic number.

660043 is a deficient number, since it is larger than the sum of its proper divisors (17877).

660043 is a wasteful number, since it uses less digits than its factorization.

660043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17876.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 660043 is about 812.4303047031. The cubic root of 660043 is about 87.0677676953.

The spelling of 660043 in words is "six hundred sixty thousand, forty-three".