138231135 has 24 divisors (see below), whose sum is σ = 273829920. Its totient is φ = 63191232.

The previous prime is 138231133. The next prime is 138231143. The reversal of 138231135 is 531132831.

It is not a de Polignac number, because 138231135 - 2¹ = 138231133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138231099 and 138231108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138231133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219100 + ... + 219729.

It is an arithmetic number, because the mean of its divisors is an integer number (11409580).

Almost surely, 2^138231135 is an apocalyptic number.

138231135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138231135 is a deficient number, since it is larger than the sum of its proper divisors (135598785).

138231135 is a wasteful number, since it uses less digits than its factorization.

138231135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438847 (or 438844 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 138231135 is about 11757.1737675344. The cubic root of 138231135 is about 517.0532726726.

Adding to 138231135 its reverse (531132831), we get a palindrome (669363966).

The spelling of 138231135 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, one hundred thirty-five".