138506272 has 24 divisors (see below), whose sum is σ = 274654800. Its totient is φ = 68752704.

The previous prime is 138506243. The next prime is 138506273. The reversal of 138506272 is 272605831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138506273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11122 + ... + 20017.

It is an arithmetic number, because the mean of its divisors is an integer number (11443950).

Almost surely, 2^138506272 is an apocalyptic number.

It is an amenable number.

138506272 is a deficient number, since it is larger than the sum of its proper divisors (136148528).

138506272 is a wasteful number, since it uses less digits than its factorization.

138506272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31288 (or 31280 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 138506272 is about 11768.8687646689. The cubic root of 138506272 is about 517.3960951123.

The spelling of 138506272 in words is "one hundred thirty-eight million, five hundred six thousand, two hundred seventy-two".