127889005 has 4 divisors (see below), whose sum is σ = 153466812. Its totient is φ = 102311200.

The previous prime is 127888991. The next prime is 127889017. The reversal of 127889005 is 500988721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500988721 = 251 ⋅1995971.

It can be written as a sum of positive squares in 2 ways, for example, as 92044836 + 35844169 = 9594^2 + 5987^2 .

It is not a de Polignac number, because 127889005 - 2¹³ = 127880813 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12788896 + ... + 12788905.

It is an arithmetic number, because the mean of its divisors is an integer number (38366703).

Almost surely, 2^127889005 is an apocalyptic number.

It is an amenable number.

127889005 is a deficient number, since it is larger than the sum of its proper divisors (25577807).

127889005 is an equidigital number, since it uses as much as digits as its factorization.

127889005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25577806.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 127889005 is about 11308.8021027870. The cubic root of 127889005 is about 503.8227060220.

The spelling of 127889005 in words is "one hundred twenty-seven million, eight hundred eighty-nine thousand, five".