39981194152 has 8 divisors (see below), whose sum is σ = 74964739050. Its totient is φ = 19990597072.

The previous prime is 39981194129. The next prime is 39981194153. The reversal of 39981194152 is 25149118993.

It can be written as a sum of positive squares in only one way, i.e., 29492566756 + 10488627396 = 171734^2 + 102414^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 39981194152.

It is not an unprimeable number, because it can be changed into a prime (39981194153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2498824627 + ... + 2498824642.

Almost surely, 2^39981194152 is an apocalyptic number.

It is an amenable number.

39981194152 is a deficient number, since it is larger than the sum of its proper divisors (34983544898).

39981194152 is a wasteful number, since it uses less digits than its factorization.

39981194152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4997649275 (or 4997649271 counting only the distinct ones).

The product of its digits is 699840, while the sum is 52.

The spelling of 39981194152 in words is "thirty-nine billion, nine hundred eighty-one million, one hundred ninety-four thousand, one hundred fifty-two".