138450647 has 2 divisors, whose sum is σ = 138450648. Its totient is φ = 138450646.

The previous prime is 138450577. The next prime is 138450649. The reversal of 138450647 is 746054831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138450647 - 2²⁶ = 71341783 is a prime.

Together with 138450649, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138450647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138450649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69225323 + 69225324.

It is an arithmetic number, because the mean of its divisors is an integer number (69225324).

Almost surely, 2^138450647 is an apocalyptic number.

138450647 is a deficient number, since it is larger than the sum of its proper divisors (1).

138450647 is an equidigital number, since it uses as much as digits as its factorization.

138450647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 138450647 is about 11766.5053010654. The cubic root of 138450647 is about 517.3268226502.

The spelling of 138450647 in words is "one hundred thirty-eight million, four hundred fifty thousand, six hundred forty-seven".