665347 has 4 divisors (see below), whose sum is σ = 688320. Its totient is φ = 642376.

The previous prime is 665311. The next prime is 665351. The reversal of 665347 is 743566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665347 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (665387) 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, 11443 + ... + 11500.

It is an arithmetic number, because the mean of its divisors is an integer number (172080).

2⁶⁶⁵³⁴⁷ is an apocalyptic number.

665347 is a deficient number, since it is larger than the sum of its proper divisors (22973).

665347 is a wasteful number, since it uses less digits than its factorization.

665347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22972.

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

The square root of 665347 is about 815.6880531183. The cubic root of 665347 is about 87.3003666468.

The spelling of 665347 in words is "six hundred sixty-five thousand, three hundred forty-seven".