138988127 has 4 divisors (see below), whose sum is σ = 139105056. Its totient is φ = 138871200.

The previous prime is 138988123. The next prime is 138988139. The reversal of 138988127 is 721889831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 721889831 = 13 ⋅55529987.

It is a cyclic number.

It is not a de Polignac number, because 138988127 - 2² = 138988123 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 (138988121) 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, 56663 + ... + 59064.

It is an arithmetic number, because the mean of its divisors is an integer number (34776264).

Almost surely, 2^138988127 is an apocalyptic number.

138988127 is a deficient number, since it is larger than the sum of its proper divisors (116929).

138988127 is a wasteful number, since it uses less digits than its factorization.

138988127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116928.

The product of its digits is 193536, while the sum is 47.

The square root of 138988127 is about 11789.3225844405. The cubic root of 138988127 is about 517.9953973145.

The spelling of 138988127 in words is "one hundred thirty-eight million, nine hundred eighty-eight thousand, one hundred twenty-seven".