538681 has 8 divisors (see below), whose sum is σ = 633024. Its totient is φ = 451920.

The previous prime is 538651. The next prime is 538697. The reversal of 538681 is 186835.

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

It is a cyclic number.

It is not a de Polignac number, because 538681 - 2⁵ = 538649 is a prime.

It is a super-2 number, since 2×538681² = 580354439522, which contains 22 as substring.

It is a Duffinian number.

538681 is a lucky number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (538621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1741 + ... + 2026.

It is an arithmetic number, because the mean of its divisors is an integer number (79128).

2⁵³⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

538681 is a deficient number, since it is larger than the sum of its proper divisors (94343).

538681 is a wasteful number, since it uses less digits than its factorization.

538681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791.

The product of its digits is 5760, while the sum is 31.

The square root of 538681 is about 733.9489083036. The cubic root of 538681 is about 81.3661722778.

The spelling of 538681 in words is "five hundred thirty-eight thousand, six hundred eighty-one".