138959 has 2 divisors, whose sum is σ = 138960. Its totient is φ = 138958.
The previous prime is 138937. The next prime is 138967. The reversal of 138959 is 959831.
It is a strong prime.
It is an emirp because it is prime and its reverse (959831) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-138959 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (138059) 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 as a sum of consecutive naturals, namely, 69479 + 69480.
It is an arithmetic number, because the mean of its divisors is an integer number (69480).
2138959 is an apocalyptic number.
138959 is a deficient number, since it is larger than the sum of its proper divisors (1).
138959 is an equidigital number, since it uses as much as digits as its factorization.
138959 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 9720, while the sum is 35.
The square root of 138959 is about 372.7720483083. The cubic root of 138959 is about 51.7959210276.
The spelling of 138959 in words is "one hundred thirty-eight thousand, nine hundred fifty-nine".
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