538689 has 4 divisors (see below), whose sum is σ = 718256. Its totient is φ = 359124.

The previous prime is 538651. The next prime is 538697. The reversal of 538689 is 986835.

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.

It is not a de Polignac number, because 538689 - 2⁷ = 538561 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538649) 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, 89779 + ... + 89784.

It is an arithmetic number, because the mean of its divisors is an integer number (179564).

2⁵³⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

538689 is a deficient number, since it is larger than the sum of its proper divisors (179567).

538689 is a wasteful number, since it uses less digits than its factorization.

538689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179566.

The product of its digits is 51840, while the sum is 39.

The square root of 538689 is about 733.9543582540. The cubic root of 538689 is about 81.3665750679.

The spelling of 538689 in words is "five hundred thirty-eight thousand, six hundred eighty-nine".