127666138 has 8 divisors (see below), whose sum is σ = 191564820. Its totient is φ = 63811200.

The previous prime is 127666129. The next prime is 127666151. The reversal of 127666138 is 831666721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 113998329 + 13667809 = 10677^2 + 3697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 127666138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2263 + ... + 16138.

Almost surely, 2^127666138 is an apocalyptic number.

127666138 is a deficient number, since it is larger than the sum of its proper divisors (63898682).

127666138 is a wasteful number, since it uses less digits than its factorization.

127666138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21872.

The product of its digits is 72576, while the sum is 40.

The square root of 127666138 is about 11298.9441099600. The cubic root of 127666138 is about 503.5298720306.

The spelling of 127666138 in words is "one hundred twenty-seven million, six hundred sixty-six thousand, one hundred thirty-eight".