138788029 has 2 divisors, whose sum is σ = 138788030. Its totient is φ = 138788028.

The previous prime is 138787991. The next prime is 138788053. The reversal of 138788029 is 920887831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72284004 + 66504025 = 8502^2 + 8155^2 .

It is a cyclic number.

It is not a de Polignac number, because 138788029 - 2²⁷ = 4570301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138788029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138788059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69394014 + 69394015.

It is an arithmetic number, because the mean of its divisors is an integer number (69394015).

Almost surely, 2^138788029 is an apocalyptic number.

It is an amenable number.

138788029 is a deficient number, since it is larger than the sum of its proper divisors (1).

138788029 is an equidigital number, since it uses as much as digits as its factorization.

138788029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 138788029 is about 11780.8331199453. The cubic root of 138788029 is about 517.7466959186.

The spelling of 138788029 in words is "one hundred thirty-eight million, seven hundred eighty-eight thousand, twenty-nine".