127889905 has 24 divisors (see below), whose sum is σ = 181301760. Its totient is φ = 85849920.

The previous prime is 127889873. The next prime is 127889917. The reversal of 127889905 is 509988721.

It is not a de Polignac number, because 127889905 - 2⁵ = 127889873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2416 + ... + 16174.

It is an arithmetic number, because the mean of its divisors is an integer number (7554240).

Almost surely, 2^127889905 is an apocalyptic number.

It is an amenable number.

127889905 is a deficient number, since it is larger than the sum of its proper divisors (53411855).

127889905 is a wasteful number, since it uses less digits than its factorization.

127889905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13801 (or 13788 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

The square root of 127889905 is about 11308.8418947300. The cubic root of 127889905 is about 503.8238878785.

The spelling of 127889905 in words is "one hundred twenty-seven million, eight hundred eighty-nine thousand, nine hundred five".