138429737 has 2 divisors, whose sum is σ = 138429738. Its totient is φ = 138429736.

The previous prime is 138429721. The next prime is 138429769. The reversal of 138429737 is 737924831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122301481 + 16128256 = 11059^2 + 4016^2 .

It is a cyclic number.

It is not a de Polignac number, because 138429737 - 2⁴ = 138429721 is a prime.

It is not a weakly prime, because it can be changed into another prime (138429337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69214868 + 69214869.

It is an arithmetic number, because the mean of its divisors is an integer number (69214869).

Almost surely, 2^138429737 is an apocalyptic number.

It is an amenable number.

138429737 is a deficient number, since it is larger than the sum of its proper divisors (1).

138429737 is an equidigital number, since it uses as much as digits as its factorization.

138429737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 138429737 is about 11765.6167284167. The cubic root of 138429737 is about 517.3007776329.

The spelling of 138429737 in words is "one hundred thirty-eight million, four hundred twenty-nine thousand, seven hundred thirty-seven".