538391 has 4 divisors (see below), whose sum is σ = 615312. Its totient is φ = 461472.

The previous prime is 538367. The next prime is 538397. The reversal of 538391 is 193835.

538391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193835 = 5 ⋅38767.

It is a cyclic number.

It is not a de Polignac number, because 538391 - 2¹⁸ = 276247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538397) 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, 38450 + ... + 38463.

It is an arithmetic number, because the mean of its divisors is an integer number (153828).

2⁵³⁸³⁹¹ is an apocalyptic number.

538391 is a deficient number, since it is larger than the sum of its proper divisors (76921).

538391 is an equidigital number, since it uses as much as digits as its factorization.

538391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76920.

The product of its digits is 3240, while the sum is 29.

The square root of 538391 is about 733.7513202714. The cubic root of 538391 is about 81.3515684426.

It can be divided in two parts, 538 and 391, that added together give a palindrome (929).

The spelling of 538391 in words is "five hundred thirty-eight thousand, three hundred ninety-one".