138900029 has 2 divisors, whose sum is σ = 138900030. Its totient is φ = 138900028.

The previous prime is 138900007. The next prime is 138900037. The reversal of 138900029 is 920009831.

138900029 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97555129 + 41344900 = 9877^2 + 6430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138900029 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138899968 and 138900004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138900329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69450014 + 69450015.

It is an arithmetic number, because the mean of its divisors is an integer number (69450015).

Almost surely, 2^138900029 is an apocalyptic number.

It is an amenable number.

138900029 is a deficient number, since it is larger than the sum of its proper divisors (1).

138900029 is an equidigital number, since it uses as much as digits as its factorization.

138900029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 138900029 is about 11785.5856451854. The cubic root of 138900029 is about 517.8859299216.

The spelling of 138900029 in words is "one hundred thirty-eight million, nine hundred thousand, twenty-nine".