127681138 has 8 divisors (see below), whose sum is σ = 206254188. Its totient is φ = 58929744.

The previous prime is 127681129. The next prime is 127681139. The reversal of 127681138 is 831186721.

It can be written as a sum of positive squares in 2 ways, for example, as 111576969 + 16104169 = 10563^2 + 4013^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 127681097 and 127681106.

It is not an unprimeable number, because it can be changed into a prime (127681139) 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, 2455381 + ... + 2455432.

Almost surely, 2^127681138 is an apocalyptic number.

127681138 is a deficient number, since it is larger than the sum of its proper divisors (78573050).

127681138 is a wasteful number, since it uses less digits than its factorization.

127681138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910828.

The product of its digits is 16128, while the sum is 37.

The square root of 127681138 is about 11299.6078693024. The cubic root of 127681138 is about 503.5495918311.

The spelling of 127681138 in words is "one hundred twenty-seven million, six hundred eighty-one thousand, one hundred thirty-eight".