138072306 has 16 divisors (see below), whose sum is σ = 285667200. Its totient is φ = 44437008.

The previous prime is 138072287. The next prime is 138072307. The reversal of 138072306 is 603270831.

It is not an unprimeable number, because it can be changed into a prime (138072307) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 396586 + ... + 396933.

It is an arithmetic number, because the mean of its divisors is an integer number (17854200).

Almost surely, 2^138072306 is an apocalyptic number.

138072306 is an abundant number, since it is smaller than the sum of its proper divisors (147594894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138072306 is a wasteful number, since it uses less digits than its factorization.

138072306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793553.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 138072306 is about 11750.4172691867. The cubic root of 138072306 is about 516.8551635955.

The spelling of 138072306 in words is "one hundred thirty-eight million, seventy-two thousand, three hundred six".