523640039 has 4 divisors (see below), whose sum is σ = 563920056. Its totient is φ = 483360024.

The previous prime is 523640027. The next prime is 523640081. The reversal of 523640039 is 930046325.

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

It is a cyclic number.

It is not a de Polignac number, because 523640039 - 2⁸ = 523639783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 523639987 and 523640014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523640009) 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, 20139989 + ... + 20140014.

It is an arithmetic number, because the mean of its divisors is an integer number (140980014).

Almost surely, 2^523640039 is an apocalyptic number.

523640039 is a deficient number, since it is larger than the sum of its proper divisors (40280017).

523640039 is a wasteful number, since it uses less digits than its factorization.

523640039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40280016.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 523640039 is about 22883.1824491263. The cubic root of 523640039 is about 806.0171492389.

The spelling of 523640039 in words is "five hundred twenty-three million, six hundred forty thousand, thirty-nine".