138530272 has 24 divisors (see below), whose sum is σ = 276806376. Its totient is φ = 68230272.

The previous prime is 138530251. The next prime is 138530279. The reversal of 138530272 is 272035831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138530279) 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 3 ways as a sum of consecutive naturals, for example, 30163 + ... + 34450.

It is an arithmetic number, because the mean of its divisors is an integer number (11533599).

Almost surely, 2^138530272 is an apocalyptic number.

It is an amenable number.

138530272 is a deficient number, since it is larger than the sum of its proper divisors (138276104).

138530272 is an equidigital number, since it uses as much as digits as its factorization.

138530272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64690 (or 64682 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 138530272 is about 11769.8883597084. Note that the first 3 decimals coincide. The cubic root of 138530272 is about 517.4259777280.

The spelling of 138530272 in words is "one hundred thirty-eight million, five hundred thirty thousand, two hundred seventy-two".