388638631105 has 12 divisors (see below), whose sum is σ = 492203830932. Its totient is φ = 294547171680.

The previous prime is 388638631091. The next prime is 388638631141. The reversal of 388638631105 is 501136836883.

It can be written as a sum of positive squares in 2 ways, for example, as 103508262529 + 285130368576 = 321727^2 + 533976^2 .

It is not a de Polignac number, because 388638631105 - 2²¹ = 388636533953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107654326 + ... + 107657935.

It is an arithmetic number, because the mean of its divisors is an integer number (41016985911).

Almost surely, 2^388638631105 is an apocalyptic number.

It is an amenable number.

388638631105 is a deficient number, since it is larger than the sum of its proper divisors (103565199827).

388638631105 is a wasteful number, since it uses less digits than its factorization.

388638631105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215312304 (or 215312285 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 388638631105 in words is "three hundred eighty-eight billion, six hundred thirty-eight million, six hundred thirty-one thousand, one hundred five".