127975789 has 4 divisors (see below), whose sum is σ = 129728956. Its totient is φ = 126222624.

The previous prime is 127975747. The next prime is 127975817. The reversal of 127975789 is 987579721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47155689 + 80820100 = 6867^2 + 8990^2 .

It is a cyclic number.

It is not a de Polignac number, because 127975789 - 2¹⁵ = 127943021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127975739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876474 + ... + 876619.

It is an arithmetic number, because the mean of its divisors is an integer number (32432239).

Almost surely, 2^127975789 is an apocalyptic number.

It is an amenable number.

127975789 is a deficient number, since it is larger than the sum of its proper divisors (1753167).

127975789 is an equidigital number, since it uses as much as digits as its factorization.

127975789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753166.

The product of its digits is 2222640, while the sum is 55.

The square root of 127975789 is about 11312.6384632410. The cubic root of 127975789 is about 503.9366430080.

The spelling of 127975789 in words is "one hundred twenty-seven million, nine hundred seventy-five thousand, seven hundred eighty-nine".