538381 has 4 divisors (see below), whose sum is σ = 543712. Its totient is φ = 533052.

The previous prime is 538367. The next prime is 538397. The reversal of 538381 is 183835.

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, and also an emirpimes, since its reverse is a distinct semiprime: 183835 = 5 ⋅36767.

It is a cyclic number.

It is not a de Polignac number, because 538381 - 2¹⁵ = 505613 is a prime.

It is a super-2 number, since 2×538381² = 579708202322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538301) 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, 2511 + ... + 2716.

It is an arithmetic number, because the mean of its divisors is an integer number (135928).

2⁵³⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

538381 is a deficient number, since it is larger than the sum of its proper divisors (5331).

538381 is a wasteful number, since it uses less digits than its factorization.

538381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330.

The product of its digits is 2880, while the sum is 28.

The square root of 538381 is about 733.7445059420. The cubic root of 538381 is about 81.3510647686.

It can be divided in two parts, 538 and 381, that added together give a palindrome (919).

The spelling of 538381 in words is "five hundred thirty-eight thousand, three hundred eighty-one".