39991935168 has 112 divisors (see below), whose sum is σ = 117620796000. Its totient is φ = 13324760064.

The previous prime is 39991935161. The next prime is 39991935187. The reversal of 39991935168 is 86153919993.

It is a happy number.

39991935168 is a `hidden beast` number, since 399 + 9 + 193 + 51 + 6 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (39991935161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5852778 + ... + 5859606.

Almost surely, 2^39991935168 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 39991935168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58810398000).

39991935168 is an abundant number, since it is smaller than the sum of its proper divisors (77628860832).

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

39991935168 is a wasteful number, since it uses less digits than its factorization.

39991935168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10239 (or 10223 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 63.

The spelling of 39991935168 in words is "thirty-nine billion, nine hundred ninety-one million, nine hundred thirty-five thousand, one hundred sixty-eight".