138640367 has 2 divisors, whose sum is σ = 138640368. Its totient is φ = 138640366.

The previous prime is 138640363. The next prime is 138640391. The reversal of 138640367 is 763046831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138640367 - 2² = 138640363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138640367.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138640363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69320183 + 69320184.

It is an arithmetic number, because the mean of its divisors is an integer number (69320184).

Almost surely, 2^138640367 is an apocalyptic number.

138640367 is a deficient number, since it is larger than the sum of its proper divisors (1).

138640367 is an equidigital number, since it uses as much as digits as its factorization.

138640367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 138640367 is about 11774.5644080790. The cubic root of 138640367 is about 517.5630137897.

The spelling of 138640367 in words is "one hundred thirty-eight million, six hundred forty thousand, three hundred sixty-seven".