39609909523 has 4 divisors (see below), whose sum is σ = 39760517808. Its totient is φ = 39459301240.

The previous prime is 39609909481. The next prime is 39609909533. The reversal of 39609909523 is 32590990693.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39609909523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39609909533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75303748 + ... + 75304273.

It is an arithmetic number, because the mean of its divisors is an integer number (9940129452).

Almost surely, 2^39609909523 is an apocalyptic number.

39609909523 is a deficient number, since it is larger than the sum of its proper divisors (150608285).

39609909523 is a wasteful number, since it uses less digits than its factorization.

39609909523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150608284.

The product of its (nonzero) digits is 3542940, while the sum is 55.

The spelling of 39609909523 in words is "thirty-nine billion, six hundred nine million, nine hundred nine thousand, five hundred twenty-three".