138465919 has 2 divisors, whose sum is σ = 138465920. Its totient is φ = 138465918.

The previous prime is 138465893. The next prime is 138465937. The reversal of 138465919 is 919564831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138465919 - 2¹³ = 138457727 is a prime.

It is a super-2 number, since 2×138465919² = 38345621449029122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138465319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69232959 + 69232960.

It is an arithmetic number, because the mean of its divisors is an integer number (69232960).

Almost surely, 2^138465919 is an apocalyptic number.

138465919 is a deficient number, since it is larger than the sum of its proper divisors (1).

138465919 is an equidigital number, since it uses as much as digits as its factorization.

138465919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 46.

The square root of 138465919 is about 11767.1542439113. The cubic root of 138465919 is about 517.3458434467.

The spelling of 138465919 in words is "one hundred thirty-eight million, four hundred sixty-five thousand, nine hundred nineteen".