138717187 has 6 divisors (see below), whose sum is σ = 161364948. Its totient is φ = 118900404.

The previous prime is 138717149. The next prime is 138717191. The reversal of 138717187 is 781717831.

It is a de Polignac number, because none of the positive numbers 2^k-138717187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138717287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1415433 + ... + 1415530.

It is an arithmetic number, because the mean of its divisors is an integer number (26894158).

Almost surely, 2^138717187 is an apocalyptic number.

138717187 is a deficient number, since it is larger than the sum of its proper divisors (22647761).

138717187 is an equidigital number, since it uses as much as digits as its factorization.

138717187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830977 (or 2830970 counting only the distinct ones).

The product of its digits is 65856, while the sum is 43.

The square root of 138717187 is about 11777.8260727521. The cubic root of 138717187 is about 517.6585892472.

The spelling of 138717187 in words is "one hundred thirty-eight million, seven hundred seventeen thousand, one hundred eighty-seven".