538665239 has 4 divisors (see below), whose sum is σ = 615617424. Its totient is φ = 461713056.

The previous prime is 538665217. The next prime is 538665241. The reversal of 538665239 is 932566835.

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

It is a de Polignac number, because none of the positive numbers 2^k-538665239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 538665193 and 538665202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538665209) 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, 38476082 + ... + 38476095.

It is an arithmetic number, because the mean of its divisors is an integer number (153904356).

Almost surely, 2^538665239 is an apocalyptic number.

538665239 is a deficient number, since it is larger than the sum of its proper divisors (76952185).

538665239 is an equidigital number, since it uses as much as digits as its factorization.

538665239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76952184.

The product of its digits is 1166400, while the sum is 47.

The square root of 538665239 is about 23209.1628241951. The cubic root of 538665239 is about 813.6537871922.

The spelling of 538665239 in words is "five hundred thirty-eight million, six hundred sixty-five thousand, two hundred thirty-nine".