138786239 has 2 divisors, whose sum is σ = 138786240. Its totient is φ = 138786238.

The previous prime is 138786233. The next prime is 138786259. The reversal of 138786239 is 932687831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138786239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138786193 and 138786202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138786233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69393119 + 69393120.

It is an arithmetic number, because the mean of its divisors is an integer number (69393120).

Almost surely, 2^138786239 is an apocalyptic number.

138786239 is a deficient number, since it is larger than the sum of its proper divisors (1).

138786239 is an equidigital number, since it uses as much as digits as its factorization.

138786239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 138786239 is about 11780.7571488423. The cubic root of 138786239 is about 517.7444700529.

The spelling of 138786239 in words is "one hundred thirty-eight million, seven hundred eighty-six thousand, two hundred thirty-nine".