665386 has 8 divisors (see below), whose sum is σ = 1001664. Its totient is φ = 331500.

The previous prime is 665381. The next prime is 665387. The reversal of 665386 is 683566.

665386 is nontrivially palindromic in base 16.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665386.

It is not an unprimeable number, because it can be changed into a prime (665381) 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, 511 + ... + 1261.

It is an arithmetic number, because the mean of its divisors is an integer number (125208).

2⁶⁶⁵³⁸⁶ is an apocalyptic number.

665386 is a deficient number, since it is larger than the sum of its proper divisors (336278).

665386 is a wasteful number, since it uses less digits than its factorization.

665386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196.

The product of its digits is 25920, while the sum is 34.

The square root of 665386 is about 815.7119589659. The cubic root of 665386 is about 87.3020723471.

The spelling of 665386 in words is "six hundred sixty-five thousand, three hundred eighty-six".