138258128 has 10 divisors (see below), whose sum is σ = 267875154. Its totient is φ = 69129056.

The previous prime is 138258119. The next prime is 138258139. The reversal of 138258128 is 821852831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 83320384 + 54937744 = 9128^2 + 7412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138258091 and 138258100.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4320551 + ... + 4320582.

Almost surely, 2^138258128 is an apocalyptic number.

It is an amenable number.

138258128 is a deficient number, since it is larger than the sum of its proper divisors (129617026).

138258128 is an equidigital number, since it uses as much as digits as its factorization.

138258128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8641141 (or 8641135 counting only the distinct ones).

The product of its digits is 30720, while the sum is 38.

The square root of 138258128 is about 11758.3216489429. The cubic root of 138258128 is about 517.0869262356.

The spelling of 138258128 in words is "one hundred thirty-eight million, two hundred fifty-eight thousand, one hundred twenty-eight".