138320029 has 2 divisors, whose sum is σ = 138320030. Its totient is φ = 138320028.

The previous prime is 138320011. The next prime is 138320033. The reversal of 138320029 is 920023831.

138320029 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., 135187129 + 3132900 = 11627^2 + 1770^2 .

It is an emirp because it is prime and its reverse (920023831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138320029 - 2⁵ = 138319997 is a prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 138320029 parts by 16632 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 138319979 and 138320006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138320009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69160014 + 69160015.

It is an arithmetic number, because the mean of its divisors is an integer number (69160015).

Almost surely, 2^138320029 is an apocalyptic number.

It is an amenable number.

138320029 is a deficient number, since it is larger than the sum of its proper divisors (1).

138320029 is an equidigital number, since it uses as much as digits as its factorization.

138320029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 138320029 is about 11760.9535752846. The cubic root of 138320029 is about 517.1640848628.

It can be divided in two parts, 1383 and 20029, that added together give a palindrome (21412).

The spelling of 138320029 in words is "one hundred thirty-eight million, three hundred twenty thousand, twenty-nine".