39899906038128 has 80 divisors (see below), whose sum is σ = 105452845585920. Its totient is φ = 12994113243648.

The previous prime is 39899906038123. The next prime is 39899906038147. The reversal of 39899906038128 is 82183060999893.

It is a self number, because there is not a number n which added to its sum of digits gives 39899906038128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39899906038123) 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, 14257750 + ... + 16825077.

It is an arithmetic number, because the mean of its divisors is an integer number (1318160569824).

Almost surely, 2^{39899906038128} is an apocalyptic number.

It is an amenable number.

39899906038128 is an abundant number, since it is smaller than the sum of its proper divisors (65552939547792).

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

39899906038128 is a wasteful number, since it uses less digits than its factorization.

39899906038128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31083454 (or 31083448 counting only the distinct ones).

The product of its (nonzero) digits is 362797056, while the sum is 75.

The spelling of 39899906038128 in words is "thirty-nine trillion, eight hundred ninety-nine billion, nine hundred six million, thirty-eight thousand, one hundred twenty-eight".