138867217 has 4 divisors (see below), whose sum is σ = 140540400. Its totient is φ = 137194036.

The previous prime is 138867193. The next prime is 138867233. The reversal of 138867217 is 712768831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138867217 - 2¹⁹ = 138342929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138867247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 836467 + ... + 836632.

It is an arithmetic number, because the mean of its divisors is an integer number (35135100).

Almost surely, 2^138867217 is an apocalyptic number.

It is an amenable number.

138867217 is a deficient number, since it is larger than the sum of its proper divisors (1673183).

138867217 is an equidigital number, since it uses as much as digits as its factorization.

138867217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673182.

The product of its digits is 112896, while the sum is 43.

The square root of 138867217 is about 11784.1935235297. The cubic root of 138867217 is about 517.8451470855.

The spelling of 138867217 in words is "one hundred thirty-eight million, eight hundred sixty-seven thousand, two hundred seventeen".