138862517 has 8 divisors (see below), whose sum is σ = 144221400. Its totient is φ = 133588224.

The previous prime is 138862501. The next prime is 138862519. The reversal of 138862517 is 715268831.

It can be written as a sum of positive squares in 4 ways, for example, as 69872881 + 68989636 = 8359^2 + 8306^2 .

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 138862517 - 2⁴ = 138862501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138862519) 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, 17792 + ... + 24377.

It is an arithmetic number, because the mean of its divisors is an integer number (18027675).

Almost surely, 2^138862517 is an apocalyptic number.

It is an amenable number.

138862517 is a deficient number, since it is larger than the sum of its proper divisors (5358883).

138862517 is an equidigital number, since it uses as much as digits as its factorization.

138862517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42295.

The product of its digits is 80640, while the sum is 41.

The square root of 138862517 is about 11783.9941021710. The cubic root of 138862517 is about 517.8393048147.

The spelling of 138862517 in words is "one hundred thirty-eight million, eight hundred sixty-two thousand, five hundred seventeen".