660442 has 8 divisors (see below), whose sum is σ = 1004832. Its totient is φ = 325500.

The previous prime is 660409. The next prime is 660449. The reversal of 660442 is 244066.

660442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (660449) by changing a digit.

660442 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, 2184 + ... + 2467.

It is an arithmetic number, because the mean of its divisors is an integer number (125604).

2⁶⁶⁰⁴⁴² is an apocalyptic number.

660442 is a deficient number, since it is larger than the sum of its proper divisors (344390).

660442 is a wasteful number, since it uses less digits than its factorization.

660442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4724.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 660442 is about 812.6758271291. The cubic root of 660442 is about 87.0853084926.

The spelling of 660442 in words is "six hundred sixty thousand, four hundred forty-two".