138723227 has 2 divisors, whose sum is σ = 138723228. Its totient is φ = 138723226.

The previous prime is 138723223. The next prime is 138723239. The reversal of 138723227 is 722327831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138723227 - 2² = 138723223 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138723223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69361613 + 69361614.

It is an arithmetic number, because the mean of its divisors is an integer number (69361614).

Almost surely, 2^138723227 is an apocalyptic number.

138723227 is a deficient number, since it is larger than the sum of its proper divisors (1).

138723227 is an equidigital number, since it uses as much as digits as its factorization.

138723227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 138723227 is about 11778.0824840039. The cubic root of 138723227 is about 517.6661024054. Note that the first 3 decimals are identical.

The spelling of 138723227 in words is "one hundred thirty-eight million, seven hundred twenty-three thousand, two hundred twenty-seven".