138342829 has 2 divisors, whose sum is σ = 138342830. Its totient is φ = 138342828.

The previous prime is 138342817. The next prime is 138342851. The reversal of 138342829 is 928243831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76090729 + 62252100 = 8723^2 + 7890^2 .

It is a cyclic number.

It is not a de Polignac number, because 138342829 - 2⁵ = 138342797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138342791 and 138342800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138342859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69171414 + 69171415.

It is an arithmetic number, because the mean of its divisors is an integer number (69171415).

Almost surely, 2^138342829 is an apocalyptic number.

It is an amenable number.

138342829 is a deficient number, since it is larger than the sum of its proper divisors (1).

138342829 is an equidigital number, since it uses as much as digits as its factorization.

138342829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 138342829 is about 11761.9228445012. The cubic root of 138342829 is about 517.1924989048.

The spelling of 138342829 in words is "one hundred thirty-eight million, three hundred forty-two thousand, eight hundred twenty-nine".