138824447 has 2 divisors, whose sum is σ = 138824448. Its totient is φ = 138824446.

The previous prime is 138824381. The next prime is 138824453. The reversal of 138824447 is 744428831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138824447 - 2¹⁴ = 138808063 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138824467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69412223 + 69412224.

It is an arithmetic number, because the mean of its divisors is an integer number (69412224).

Almost surely, 2^138824447 is an apocalyptic number.

138824447 is a deficient number, since it is larger than the sum of its proper divisors (1).

138824447 is an equidigital number, since it uses as much as digits as its factorization.

138824447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172032, while the sum is 41.

The square root of 138824447 is about 11782.3786647688. The cubic root of 138824447 is about 517.7919775623.

The spelling of 138824447 in words is "one hundred thirty-eight million, eight hundred twenty-four thousand, four hundred forty-seven".