665446 has 8 divisors (see below), whose sum is σ = 1030464. Its totient is φ = 321960.

The previous prime is 665429. The next prime is 665447. The reversal of 665446 is 644566.

665446 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 a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665447) 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, 5305 + ... + 5428.

It is an arithmetic number, because the mean of its divisors is an integer number (128808).

2⁶⁶⁵⁴⁴⁶ is an apocalyptic number.

665446 is a deficient number, since it is larger than the sum of its proper divisors (365018).

665446 is a wasteful number, since it uses less digits than its factorization.

665446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10766.

The product of its digits is 17280, while the sum is 31.

The square root of 665446 is about 815.7487358249. The cubic root of 665446 is about 87.3046963713.

It can be divided in two parts, 665 and 446, that added together give a palindrome (1111).

The spelling of 665446 in words is "six hundred sixty-five thousand, four hundred forty-six".