39642004609 has 3 divisors (see below), whose sum is σ = 39642203713. Its totient is φ = 39641805506.

The previous prime is 39642004561. The next prime is 39642004621. The reversal of 39642004609 is 90640024693.

The square root of 39642004609 is 199103.

It is a perfect power (a square), and thus also a powerful number.

39642004609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 39642004609 - 2³¹ = 37494520961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39642004639) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 99552 + ... + 298654.

Almost surely, 2^39642004609 is an apocalyptic number.

39642004609 is the 199103-rd square number.

39642004609 is the 99552-nd centered octagonal number.

It is an amenable number.

39642004609 is a deficient number, since it is larger than the sum of its proper divisors (199104).

39642004609 is an frugal number, since it uses more digits than its factorization.

39642004609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398206 (or 199103 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 43.

The spelling of 39642004609 in words is "thirty-nine billion, six hundred forty-two million, four thousand, six hundred nine".