39920952609 has 6 divisors (see below), whose sum is σ = 57663598226. Its totient is φ = 26613968400.

The previous prime is 39920952601. The next prime is 39920952629. The reversal of 39920952609 is 90625902993.

39920952609 is a `hidden beast` number, since 3 + 9 + 9 + 20 + 9 + 5 + 2 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39914046225 + 6906384 = 199785^2 + 2628^2 .

It is not a de Polignac number, because 39920952609 - 2³ = 39920952601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39920952601) 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 5 ways as a sum of consecutive naturals, for example, 2217830692 + ... + 2217830709.

Almost surely, 2^39920952609 is an apocalyptic number.

It is an amenable number.

39920952609 is a deficient number, since it is larger than the sum of its proper divisors (17742645617).

39920952609 is a wasteful number, since it uses less digits than its factorization.

39920952609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4435661407 (or 4435661404 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 54.

The spelling of 39920952609 in words is "thirty-nine billion, nine hundred twenty million, nine hundred fifty-two thousand, six hundred nine".