139965187 has 2 divisors, whose sum is σ = 139965188. Its totient is φ = 139965186.

The previous prime is 139965179. The next prime is 139965193. The reversal of 139965187 is 781569931.

It is a strong prime.

It is an emirp because it is prime and its reverse (781569931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139965187 - 2³ = 139965179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139965187.

It is not a weakly prime, because it can be changed into another prime (139965127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69982593 + 69982594.

It is an arithmetic number, because the mean of its divisors is an integer number (69982594).

Almost surely, 2^139965187 is an apocalyptic number.

139965187 is a deficient number, since it is larger than the sum of its proper divisors (1).

139965187 is an equidigital number, since it uses as much as digits as its factorization.

139965187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 139965187 is about 11830.6883569808. The cubic root of 139965187 is about 519.2063670226.

The spelling of 139965187 in words is "one hundred thirty-nine million, nine hundred sixty-five thousand, one hundred eighty-seven".