138387019 has 2 divisors, whose sum is σ = 138387020. Its totient is φ = 138387018.

The previous prime is 138387017. The next prime is 138387031. The reversal of 138387019 is 910783831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138387019 - 2¹ = 138387017 is a prime.

It is a super-2 number, since 2×138387019² = 38301934055412722, which contains 22 as substring.

Together with 138387017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (138387017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69193509 + 69193510.

It is an arithmetic number, because the mean of its divisors is an integer number (69193510).

Almost surely, 2^138387019 is an apocalyptic number.

138387019 is a deficient number, since it is larger than the sum of its proper divisors (1).

138387019 is an equidigital number, since it uses as much as digits as its factorization.

138387019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 138387019 is about 11763.8012138934. The cubic root of 138387019 is about 517.2475609167.

The spelling of 138387019 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, nineteen".