138009717 has 8 divisors (see below), whose sum is σ = 204458880. Its totient is φ = 92006460.

The previous prime is 138009713. The next prime is 138009727. The reversal of 138009717 is 717900831.

It is not a de Polignac number, because 138009717 - 2² = 138009713 is a prime.

It is a congruent number.

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, 2555709 + ... + 2555762.

It is an arithmetic number, because the mean of its divisors is an integer number (25557360).

Almost surely, 2^138009717 is an apocalyptic number.

It is an amenable number.

138009717 is a deficient number, since it is larger than the sum of its proper divisors (66449163).

138009717 is an equidigital number, since it uses as much as digits as its factorization.

138009717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111480 (or 5111474 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 138009717 is about 11747.7537001760. The cubic root of 138009717 is about 516.7770539487. Note that the first 3 decimals are identical.

The spelling of 138009717 in words is "one hundred thirty-eight million, nine thousand, seven hundred seventeen".