138924719 has 2 divisors, whose sum is σ = 138924720. Its totient is φ = 138924718.

The previous prime is 138924707. The next prime is 138924727. The reversal of 138924719 is 917429831.

It is a strong prime.

It is an emirp because it is prime and its reverse (917429831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138924719 - 2⁸ = 138924463 is a prime.

It is a super-2 number, since 2×138924719² = 38600155098457922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138924719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138924319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69462359 + 69462360.

It is an arithmetic number, because the mean of its divisors is an integer number (69462360).

Almost surely, 2^138924719 is an apocalyptic number.

138924719 is a deficient number, since it is larger than the sum of its proper divisors (1).

138924719 is an equidigital number, since it uses as much as digits as its factorization.

138924719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 138924719 is about 11786.6330646203. The cubic root of 138924719 is about 517.9166134911.

The spelling of 138924719 in words is "one hundred thirty-eight million, nine hundred twenty-four thousand, seven hundred nineteen".