388888894449 has 32 divisors (see below), whose sum is σ = 628600291200. Its totient is φ = 235655369280.

The previous prime is 388888894409. The next prime is 388888894481. The reversal of 388888894449 is 944498888883.

388888894449 is a `hidden beast` number, since 3 + 8 + 8 + 8 + 8 + 88 + 94 + 449 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-388888894449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (388888894409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1989507 + ... + 2176215.

It is an arithmetic number, because the mean of its divisors is an integer number (19643759100).

Almost surely, 2^388888894449 is an apocalyptic number.

It is an amenable number.

388888894449 is a deficient number, since it is larger than the sum of its proper divisors (239711396751).

388888894449 is a wasteful number, since it uses less digits than its factorization.

388888894449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193742 (or 193736 counting only the distinct ones).

The product of its digits is 4076863488, while the sum is 81.

The spelling of 388888894449 in words is "three hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred ninety-four thousand, four hundred forty-nine".