538665 has 8 divisors (see below), whose sum is σ = 861888. Its totient is φ = 287280.

The previous prime is 538651. The next prime is 538697. The reversal of 538665 is 566835.

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

It is not a de Polignac number, because 538665 - 2⁴ = 538649 is a prime.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17941 + ... + 17970.

It is an arithmetic number, because the mean of its divisors is an integer number (107736).

2⁵³⁸⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

538665 is a deficient number, since it is larger than the sum of its proper divisors (323223).

538665 is a wasteful number, since it uses less digits than its factorization.

538665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35919.

The product of its digits is 21600, while the sum is 33.

The square root of 538665 is about 733.9380082814. The cubic root of 538665 is about 81.3653666856.

The spelling of 538665 in words is "five hundred thirty-eight thousand, six hundred sixty-five".