138927129 has 8 divisors (see below), whose sum is σ = 202075872. Its totient is φ = 84198240.

The previous prime is 138927127. The next prime is 138927161. The reversal of 138927129 is 921729831.

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

It is not a de Polignac number, because 138927129 - 2¹ = 138927127 is a prime.

It is a super-3 number, since 3×138927129³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138927127) 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 7 ways as a sum of consecutive naturals, for example, 2104924 + ... + 2104989.

It is an arithmetic number, because the mean of its divisors is an integer number (25259484).

Almost surely, 2^138927129 is an apocalyptic number.

It is an amenable number.

138927129 is a deficient number, since it is larger than the sum of its proper divisors (63148743).

138927129 is a wasteful number, since it uses less digits than its factorization.

138927129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209927.

The product of its digits is 54432, while the sum is 42.

The square root of 138927129 is about 11786.7352986313. The cubic root of 138927129 is about 517.9196083308.

The spelling of 138927129 in words is "one hundred thirty-eight million, nine hundred twenty-seven thousand, one hundred twenty-nine".