665436 has 24 divisors (see below), whose sum is σ = 1620864. Its totient is φ = 212080.

The previous prime is 665429. The next prime is 665447. The reversal of 665436 is 634566.

665436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665436.

It is an unprimeable number.

665436 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 7 ways as a sum of consecutive naturals, for example, 930 + ... + 1481.

It is an arithmetic number, because the mean of its divisors is an integer number (67536).

2⁶⁶⁵⁴³⁶ is an apocalyptic number.

It is an amenable number.

665436 is an abundant number, since it is smaller than the sum of its proper divisors (955428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665436 is a wasteful number, since it uses less digits than its factorization.

665436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441 (or 2439 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 665436 is about 815.7426064636. The cubic root of 665436 is about 87.3042590449.

The spelling of 665436 in words is "six hundred sixty-five thousand, four hundred thirty-six".