138189427 has 2 divisors, whose sum is σ = 138189428. Its totient is φ = 138189426.

The previous prime is 138189421. The next prime is 138189433. The reversal of 138189427 is 724981831.

138189427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (138189421) and next prime (138189433).

It is a cyclic number.

It is not a de Polignac number, because 138189427 - 2³ = 138189419 is a prime.

It is not a weakly prime, because it can be changed into another prime (138189421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69094713 + 69094714.

It is an arithmetic number, because the mean of its divisors is an integer number (69094714).

Almost surely, 2^138189427 is an apocalyptic number.

138189427 is a deficient number, since it is larger than the sum of its proper divisors (1).

138189427 is an equidigital number, since it uses as much as digits as its factorization.

138189427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 138189427 is about 11755.3999081273. The cubic root of 138189427 is about 517.0012645458.

The spelling of 138189427 in words is "one hundred thirty-eight million, one hundred eighty-nine thousand, four hundred twenty-seven".