138751538 has 16 divisors (see below), whose sum is σ = 211468320. Its totient is φ = 68266656.

The previous prime is 138751531. The next prime is 138751553. The reversal of 138751538 is 835157831.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138751495 and 138751504.

It is not an unprimeable number, because it can be changed into a prime (138751531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84893 + ... + 86511.

It is an arithmetic number, because the mean of its divisors is an integer number (13216770).

Almost surely, 2^138751538 is an apocalyptic number.

138751538 is a deficient number, since it is larger than the sum of its proper divisors (72716782).

138751538 is a wasteful number, since it uses less digits than its factorization.

138751538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281.

The product of its digits is 100800, while the sum is 41.

The square root of 138751538 is about 11779.2842736730. The cubic root of 138751538 is about 517.7013155620.

It can be divided in two parts, 1387 and 51538, that added together give a palindrome (52925).

The spelling of 138751538 in words is "one hundred thirty-eight million, seven hundred fifty-one thousand, five hundred thirty-eight".