138786259 has 2 divisors, whose sum is σ = 138786260. Its totient is φ = 138786258.

The previous prime is 138786239. The next prime is 138786299. The reversal of 138786259 is 952687831.

138786259 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (952687831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138786259 - 2¹⁹ = 138261971 is a prime.

It is not a weakly prime, because it can be changed into another prime (138786239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69393129 + 69393130.

It is an arithmetic number, because the mean of its divisors is an integer number (69393130).

Almost surely, 2^138786259 is an apocalyptic number.

138786259 is a deficient number, since it is larger than the sum of its proper divisors (1).

138786259 is an equidigital number, since it uses as much as digits as its factorization.

138786259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 138786259 is about 11780.7579976842. The cubic root of 138786259 is about 517.7444949230.

The spelling of 138786259 in words is "one hundred thirty-eight million, seven hundred eighty-six thousand, two hundred fifty-nine".