138229789 has 2 divisors, whose sum is σ = 138229790. Its totient is φ = 138229788.

The previous prime is 138229787. The next prime is 138229799. The reversal of 138229789 is 987922831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89927289 + 48302500 = 9483^2 + 6950^2 .

It is a cyclic number.

It is not a de Polignac number, because 138229789 - 2¹ = 138229787 is a prime.

Together with 138229787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138229787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69114894 + 69114895.

It is an arithmetic number, because the mean of its divisors is an integer number (69114895).

Almost surely, 2^138229789 is an apocalyptic number.

It is an amenable number.

138229789 is a deficient number, since it is larger than the sum of its proper divisors (1).

138229789 is an equidigital number, since it uses as much as digits as its factorization.

138229789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 138229789 is about 11757.1165257473. The cubic root of 138229789 is about 517.0515944304.

The spelling of 138229789 in words is "one hundred thirty-eight million, two hundred twenty-nine thousand, seven hundred eighty-nine".