39981904092 has 144 divisors (see below), whose sum is σ = 113419837440. Its totient is φ = 11790664704.

The previous prime is 39981904073. The next prime is 39981904129. The reversal of 39981904092 is 29040918993.

39981904092 is a `hidden beast` number, since 399 + 81 + 90 + 4 + 0 + 92 = 666.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1848613 + ... + 1870115.

It is an arithmetic number, because the mean of its divisors is an integer number (787637760).

Almost surely, 2^39981904092 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 39981904092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56709918720).

39981904092 is an abundant number, since it is smaller than the sum of its proper divisors (73437933348).

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

39981904092 is a wasteful number, since it uses less digits than its factorization.

39981904092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21692 (or 21687 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 39981904092 in words is "thirty-nine billion, nine hundred eighty-one million, nine hundred four thousand, ninety-two".