138245869 has 2 divisors, whose sum is σ = 138245870. Its totient is φ = 138245868.

The previous prime is 138245837. The next prime is 138245959. The reversal of 138245869 is 968542831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113145769 + 25100100 = 10637^2 + 5010^2 .

It is an emirp because it is prime and its reverse (968542831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138245869 - 2⁵ = 138245837 is a prime.

It is a super-2 number, since 2×138245869² = 38223840591130322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138245069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69122934 + 69122935.

It is an arithmetic number, because the mean of its divisors is an integer number (69122935).

Almost surely, 2^138245869 is an apocalyptic number.

It is an amenable number.

138245869 is a deficient number, since it is larger than the sum of its proper divisors (1).

138245869 is an equidigital number, since it uses as much as digits as its factorization.

138245869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 138245869 is about 11757.8003470037. The cubic root of 138245869 is about 517.0716428520.

The spelling of 138245869 in words is "one hundred thirty-eight million, two hundred forty-five thousand, eight hundred sixty-nine".