138009306 has 8 divisors (see below), whose sum is σ = 276018624. Its totient is φ = 46003100.

The previous prime is 138009299. The next prime is 138009307. The reversal of 138009306 is 603900831.

It is a sphenic number, since it is the product of 3 distinct primes.

138009306 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (138009307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11500770 + ... + 11500781.

It is an arithmetic number, because the mean of its divisors is an integer number (34502328).

Almost surely, 2^138009306 is an apocalyptic number.

138009306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138009306 is a wasteful number, since it uses less digits than its factorization.

138009306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23001556.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 138009306 is about 11747.7362074572. The cubic root of 138009306 is about 516.7765409521.

The spelling of 138009306 in words is "one hundred thirty-eight million, nine thousand, three hundred six".