138495187 has 2 divisors, whose sum is σ = 138495188. Its totient is φ = 138495186.

The previous prime is 138495179. The next prime is 138495191. The reversal of 138495187 is 781594831.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (781594831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138495187 - 2³ = 138495179 is a prime.

It is not a weakly prime, because it can be changed into another prime (138492187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69247593 + 69247594.

It is an arithmetic number, because the mean of its divisors is an integer number (69247594).

Almost surely, 2^138495187 is an apocalyptic number.

138495187 is a deficient number, since it is larger than the sum of its proper divisors (1).

138495187 is an equidigital number, since it uses as much as digits as its factorization.

138495187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 138495187 is about 11768.3978093876. The cubic root of 138495187 is about 517.3822919137.

The spelling of 138495187 in words is "one hundred thirty-eight million, four hundred ninety-five thousand, one hundred eighty-seven".