138394259 has 2 divisors, whose sum is σ = 138394260. Its totient is φ = 138394258.

The previous prime is 138394219. The next prime is 138394279. The reversal of 138394259 is 952493831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138394259 - 2¹² = 138390163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138394219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69197129 + 69197130.

It is an arithmetic number, because the mean of its divisors is an integer number (69197130).

Almost surely, 2^138394259 is an apocalyptic number.

138394259 is a deficient number, since it is larger than the sum of its proper divisors (1).

138394259 is an equidigital number, since it uses as much as digits as its factorization.

138394259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 138394259 is about 11764.1089335317. The cubic root of 138394259 is about 517.2565810475.

The spelling of 138394259 in words is "one hundred thirty-eight million, three hundred ninety-four thousand, two hundred fifty-nine".