138752217 has 16 divisors (see below), whose sum is σ = 205840000. Its totient is φ = 92374992.

The previous prime is 138752213. The next prime is 138752219. The reversal of 138752217 is 712257831.

It is not a de Polignac number, because 138752217 - 2² = 138752213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138752213) 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 15 ways as a sum of consecutive naturals, for example, 19284 + ... + 25482.

It is an arithmetic number, because the mean of its divisors is an integer number (12865000).

Almost surely, 2^138752217 is an apocalyptic number.

It is an amenable number.

138752217 is a deficient number, since it is larger than the sum of its proper divisors (67087783).

138752217 is an equidigital number, since it uses as much as digits as its factorization.

138752217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037 (or 7031 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 138752217 is about 11779.3130954228. The cubic root of 138752217 is about 517.7021600418.

The spelling of 138752217 in words is "one hundred thirty-eight million, seven hundred fifty-two thousand, two hundred seventeen".