138444767 has 2 divisors, whose sum is σ = 138444768. Its totient is φ = 138444766.

The previous prime is 138444749. The next prime is 138444769. The reversal of 138444767 is 767444831.

It is a strong prime.

It is an emirp because it is prime and its reverse (767444831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138444767 - 2¹⁴ = 138428383 is a prime.

Together with 138444769, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138444769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69222383 + 69222384.

It is an arithmetic number, because the mean of its divisors is an integer number (69222384).

Almost surely, 2^138444767 is an apocalyptic number.

138444767 is a deficient number, since it is larger than the sum of its proper divisors (1).

138444767 is an equidigital number, since it uses as much as digits as its factorization.

138444767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 44.

The square root of 138444767 is about 11766.2554366289. The cubic root of 138444767 is about 517.3194989219.

The spelling of 138444767 in words is "one hundred thirty-eight million, four hundred forty-four thousand, seven hundred sixty-seven".