39866947947 has 12 divisors (see below), whose sum is σ = 59571301920. Its totient is φ = 25661483568.

The previous prime is 39866947943. The next prime is 39866948003. The reversal of 39866947947 is 74974966893.

39866947947 is a `hidden beast` number, since 3 + 98 + 6 + 69 + 479 + 4 + 7 = 666.

It is not a de Polignac number, because 39866947947 - 2² = 39866947943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39866947943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76373203 + ... + 76373724.

It is an arithmetic number, because the mean of its divisors is an integer number (4964275160).

Almost surely, 2^39866947947 is an apocalyptic number.

39866947947 is a deficient number, since it is larger than the sum of its proper divisors (19704353973).

39866947947 is a wasteful number, since it uses less digits than its factorization.

39866947947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152746962 (or 152746959 counting only the distinct ones).

The product of its digits is 493807104, while the sum is 72.

The spelling of 39866947947 in words is "thirty-nine billion, eight hundred sixty-six million, nine hundred forty-seven thousand, nine hundred forty-seven".