138928126 has 16 divisors (see below), whose sum is σ = 214040880. Its totient is φ = 67604800.

The previous prime is 138928123. The next prime is 138928177. The reversal of 138928126 is 621829831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138928121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6090 + ... + 17746.

It is an arithmetic number, because the mean of its divisors is an integer number (13377555).

Almost surely, 2^138928126 is an apocalyptic number.

138928126 is a deficient number, since it is larger than the sum of its proper divisors (75112754).

138928126 is a wasteful number, since it uses less digits than its factorization.

138928126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11819.

The product of its digits is 41472, while the sum is 40.

The square root of 138928126 is about 11786.7775918611. Note that the first 3 decimals coincide. The cubic root of 138928126 is about 517.9208472648.

The spelling of 138928126 in words is "one hundred thirty-eight million, nine hundred twenty-eight thousand, one hundred twenty-six".