665435 has 4 divisors (see below), whose sum is σ = 798528. Its totient is φ = 532344.

The previous prime is 665429. The next prime is 665447. The reversal of 665435 is 534566.

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 665435 - 2⁴ = 665419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665398 and 665407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66539 + ... + 66548.

It is an arithmetic number, because the mean of its divisors is an integer number (199632).

2⁶⁶⁵⁴³⁵ is an apocalyptic number.

665435 is a deficient number, since it is larger than the sum of its proper divisors (133093).

665435 is a wasteful number, since it uses less digits than its factorization.

665435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133092.

The product of its digits is 10800, while the sum is 29.

The square root of 665435 is about 815.7419935249. The cubic root of 665435 is about 87.3042153120.

The spelling of 665435 in words is "six hundred sixty-five thousand, four hundred thirty-five".