138399269 has 2 divisors, whose sum is σ = 138399270. Its totient is φ = 138399268.

The previous prime is 138399259. The next prime is 138399293. The reversal of 138399269 is 962993831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96628900 + 41770369 = 9830^2 + 6463^2 .

It is a cyclic number.

It is not a de Polignac number, because 138399269 - 2⁴ = 138399253 is a prime.

It is a super-2 number, since 2×138399269² = 38308715319468722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138399229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69199634 + 69199635.

It is an arithmetic number, because the mean of its divisors is an integer number (69199635).

Almost surely, 2^138399269 is an apocalyptic number.

It is an amenable number.

138399269 is a deficient number, since it is larger than the sum of its proper divisors (1).

138399269 is an equidigital number, since it uses as much as digits as its factorization.

138399269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 50.

The square root of 138399269 is about 11764.3218674091. The cubic root of 138399269 is about 517.2628226942.

The spelling of 138399269 in words is "one hundred thirty-eight million, three hundred ninety-nine thousand, two hundred sixty-nine".