• 538 can be written using four 4's:

538 has 4 divisors (see below), whose sum is σ = 810. Its totient is φ = 268.

The previous prime is 523. The next prime is 541. The reversal of 538 is 835.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835 = 5 ⋅167.

It can be written as a sum of positive squares in only one way, i.e., 529 + 9 = 23^2 + 3^2 .

It is a magnanimous number.

It is a plaindrome in base 7, base 11, base 12 and base 15.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133 + ... + 136.

538 is a deficient number, since it is larger than the sum of its proper divisors (272).

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

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

The sum of its prime factors is 271.

The product of its digits is 120, while the sum is 16.

The square root of 538 is about 23.1948270095. The cubic root of 538 is about 8.1331870140.

It can be divided in two parts, 53 and 8, that multiplied together give a palindrome (424).

The spelling of 538 in words is "five hundred thirty-eight", and thus it is an aban number and an oban number.

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