665242 has 8 divisors (see below), whose sum is σ = 1001376. Its totient is φ = 331452.

The previous prime is 665239. The next prime is 665251. The reversal of 665242 is 242566.

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

It is a plaindrome in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (125172).

2⁶⁶⁵²⁴² is an apocalyptic number.

665242 is a deficient number, since it is larger than the sum of its proper divisors (336134).

665242 is a wasteful number, since it uses less digits than its factorization.

665242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172.

The product of its digits is 2880, while the sum is 25.

The square root of 665242 is about 815.6236877384. The cubic root of 665242 is about 87.2957740454.

The spelling of 665242 in words is "six hundred sixty-five thousand, two hundred forty-two".