127665379 has 2 divisors, whose sum is σ = 127665380. Its totient is φ = 127665378.

The previous prime is 127665367. The next prime is 127665383. The reversal of 127665379 is 973566721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 127665379 - 2¹¹ = 127663331 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127665179) 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 as a sum of consecutive naturals, namely, 63832689 + 63832690.

It is an arithmetic number, because the mean of its divisors is an integer number (63832690).

Almost surely, 2^127665379 is an apocalyptic number.

127665379 is a deficient number, since it is larger than the sum of its proper divisors (1).

127665379 is an equidigital number, since it uses as much as digits as its factorization.

127665379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 46.

The square root of 127665379 is about 11298.9105227009. The cubic root of 127665379 is about 503.5288741677.

It can be divided in two parts, 12766 and 5379, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 127665379 in words is "one hundred twenty-seven million, six hundred sixty-five thousand, three hundred seventy-nine".