138673307 has 2 divisors, whose sum is σ = 138673308. Its totient is φ = 138673306.

The previous prime is 138673277. The next prime is 138673309. The reversal of 138673307 is 703376831.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (703376831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138673307 - 2⁶ = 138673243 is a prime.

Together with 138673309, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138673309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69336653 + 69336654.

It is an arithmetic number, because the mean of its divisors is an integer number (69336654).

Almost surely, 2^138673307 is an apocalyptic number.

138673307 is a deficient number, since it is larger than the sum of its proper divisors (1).

138673307 is an equidigital number, since it uses as much as digits as its factorization.

138673307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 138673307 is about 11775.9631028634. The cubic root of 138673307 is about 517.6040003509.

The spelling of 138673307 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, three hundred seven".