1389888976905 has 64 divisors (see below), whose sum is σ = 2902891703040. Its totient is φ = 622048204800.

The previous prime is 1389888976841. The next prime is 1389888976919. The reversal of 1389888976905 is 5096798889831.

1389888976905 is a `hidden beast` number, since 1 + 389 + 8 + 8 + 89 + 76 + 90 + 5 = 666.

It is not a de Polignac number, because 1389888976905 - 2⁶ = 1389888976841 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35978856 + ... + 36017465.

It is an arithmetic number, because the mean of its divisors is an integer number (45357682860).

Almost surely, 2^{1389888976905} is an apocalyptic number.

1389888976905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1389888976905 is an abundant number, since it is smaller than the sum of its proper divisors (1513002726135).

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

1389888976905 is a wasteful number, since it uses less digits than its factorization.

1389888976905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71996359 (or 71996353 counting only the distinct ones).

The product of its (nonzero) digits is 1881169920, while the sum is 81.

The spelling of 1389888976905 in words is "one trillion, three hundred eighty-nine billion, eight hundred eighty-eight million, nine hundred seventy-six thousand, nine hundred five".