138231427 has 2 divisors, whose sum is σ = 138231428. Its totient is φ = 138231426.

The previous prime is 138231421. The next prime is 138231439. The reversal of 138231427 is 724132831.

138231427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138231427 - 2¹⁹ = 137707139 is a prime.

It is not a weakly prime, because it can be changed into another prime (138231421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69115713 + 69115714.

It is an arithmetic number, because the mean of its divisors is an integer number (69115714).

Almost surely, 2^138231427 is an apocalyptic number.

138231427 is a deficient number, since it is larger than the sum of its proper divisors (1).

138231427 is an equidigital number, since it uses as much as digits as its factorization.

138231427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 138231427 is about 11757.1861854782. The cubic root of 138231427 is about 517.0536367475.

The spelling of 138231427 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, four hundred twenty-seven".