40538 has 4 divisors (see below), whose sum is σ = 60810. Its totient is φ = 20268.

The previous prime is 40531. The next prime is 40543. The reversal of 40538 is 83504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29929 + 10609 = 173^2 + 103^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133 + ... + 10136.

2⁴⁰⁵³⁸ is an apocalyptic number.

40538 is a deficient number, since it is larger than the sum of its proper divisors (20272).

40538 is a wasteful number, since it uses less digits than its factorization.

40538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20271.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 40538 is about 201.3405075984. The cubic root of 40538 is about 34.3521644479.

The spelling of 40538 in words is "forty thousand, five hundred thirty-eight".