665437 has 4 divisors (see below), whose sum is σ = 700480. Its totient is φ = 630396.

The previous prime is 665429. The next prime is 665447. The reversal of 665437 is 734566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665437 - 2³ = 665429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665399 and 665408.

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 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, 17493 + ... + 17530.

It is an arithmetic number, because the mean of its divisors is an integer number (175120).

2⁶⁶⁵⁴³⁷ is an apocalyptic number.

It is an amenable number.

665437 is a deficient number, since it is larger than the sum of its proper divisors (35043).

665437 is a wasteful number, since it uses less digits than its factorization.

665437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35042.

The product of its digits is 15120, while the sum is 31.

The square root of 665437 is about 815.7432194018. The cubic root of 665437 is about 87.3043027778.

The spelling of 665437 in words is "six hundred sixty-five thousand, four hundred thirty-seven".