39942749808 has 420 divisors, whose sum is σ = 131254067952. Its totient is φ = 11742382080.

The previous prime is 39942749729. The next prime is 39942749809. The reversal of 39942749808 is 80894724993.

39942749808 is a `hidden beast` number, since 3 + 99 + 427 + 49 + 80 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39942749809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 45337528 + ... + 45338408.

Almost surely, 2^39942749808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39942749808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65627033976).

39942749808 is an abundant number, since it is smaller than the sum of its proper divisors (91311318144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39942749808 is a wasteful number, since it uses less digits than its factorization.

39942749808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 39942749808 in words is "thirty-nine billion, nine hundred forty-two million, seven hundred forty-nine thousand, eight hundred eight".