139188239 has 2 divisors, whose sum is σ = 139188240. Its totient is φ = 139188238.

The previous prime is 139188221. The next prime is 139188241. The reversal of 139188239 is 932881931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139188239 is a prime.

It is a super-2 number, since 2×139188239² = 38746731751842242, which contains 22 as substring.

Together with 139188241, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139188239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139188209) 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, 69594119 + 69594120.

It is an arithmetic number, because the mean of its divisors is an integer number (69594120).

Almost surely, 2^139188239 is an apocalyptic number.

139188239 is a deficient number, since it is larger than the sum of its proper divisors (1).

139188239 is an equidigital number, since it uses as much as digits as its factorization.

139188239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 139188239 is about 11797.8065334197. The cubic root of 139188239 is about 518.2438775006.

The spelling of 139188239 in words is "one hundred thirty-nine million, one hundred eighty-eight thousand, two hundred thirty-nine".