138009715 has 8 divisors (see below), whose sum is σ = 165705120. Its totient is φ = 110345472.

The previous prime is 138009713. The next prime is 138009727. The reversal of 138009715 is 517900831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138009715 - 2¹ = 138009713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138009713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3427 + ... + 16963.

It is an arithmetic number, because the mean of its divisors is an integer number (20713140).

Almost surely, 2^138009715 is an apocalyptic number.

138009715 is a deficient number, since it is larger than the sum of its proper divisors (27695405).

138009715 is a wasteful number, since it uses less digits than its factorization.

138009715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15581.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 138009715 is about 11747.7536150534. The cubic root of 138009715 is about 516.7770514524. Note that the first 3 decimals are identical.

The spelling of 138009715 in words is "one hundred thirty-eight million, nine thousand, seven hundred fifteen".