39981941878 has 16 divisors (see below), whose sum is σ = 64214227440. Its totient is φ = 18603625216.

The previous prime is 39981941803. The next prime is 39981941887. The reversal of 39981941878 is 87814918993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6603376 + ... + 6609427.

It is an arithmetic number, because the mean of its divisors is an integer number (4013389215).

Almost surely, 2^39981941878 is an apocalyptic number.

39981941878 is a deficient number, since it is larger than the sum of its proper divisors (24232285562).

39981941878 is a wasteful number, since it uses less digits than its factorization.

39981941878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13212911.

The product of its digits is 31352832, while the sum is 67.

The spelling of 39981941878 in words is "thirty-nine billion, nine hundred eighty-one million, nine hundred forty-one thousand, eight hundred seventy-eight".