138888319 has 2 divisors, whose sum is σ = 138888320. Its totient is φ = 138888318.

The previous prime is 138888307. The next prime is 138888331. The reversal of 138888319 is 913888831.

138888319 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (138888307) and next prime (138888331).

It is a cyclic number.

It is not a de Polignac number, because 138888319 - 2²¹ = 136791167 is a prime.

It is a super-2 number, since 2×138888319² = 38579930309291522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138880319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69444159 + 69444160.

It is an arithmetic number, because the mean of its divisors is an integer number (69444160).

Almost surely, 2^138888319 is an apocalyptic number.

138888319 is a deficient number, since it is larger than the sum of its proper divisors (1).

138888319 is an equidigital number, since it uses as much as digits as its factorization.

138888319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 49.

The square root of 138888319 is about 11785.0888414131. The cubic root of 138888319 is about 517.8713760138.

The spelling of 138888319 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, three hundred nineteen".