138574729 has 2 divisors, whose sum is σ = 138574730. Its totient is φ = 138574728.

The previous prime is 138574721. The next prime is 138574873. The reversal of 138574729 is 927475831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135769104 + 2805625 = 11652^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 138574729 - 2³ = 138574721 is a prime.

It is not a weakly prime, because it can be changed into another prime (138574721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69287364 + 69287365.

It is an arithmetic number, because the mean of its divisors is an integer number (69287365).

Almost surely, 2^138574729 is an apocalyptic number.

It is an amenable number.

138574729 is a deficient number, since it is larger than the sum of its proper divisors (1).

138574729 is an equidigital number, since it uses as much as digits as its factorization.

138574729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The square root of 138574729 is about 11771.7767987675. The cubic root of 138574729 is about 517.4813224217.

The spelling of 138574729 in words is "one hundred thirty-eight million, five hundred seventy-four thousand, seven hundred twenty-nine".