138329257 has 6 divisors (see below), whose sum is σ = 152047994. Its totient is φ = 125753760.

The previous prime is 138329251. The next prime is 138329299. The reversal of 138329257 is 752923831.

It can be written as a sum of positive squares in only one way, i.e., 131125401 + 7203856 = 11451^2 + 2684^2 .

It is not a de Polignac number, because 138329257 - 2¹¹ = 138327209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138329251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 571488 + ... + 571729.

Almost surely, 2^138329257 is an apocalyptic number.

It is an amenable number.

138329257 is a deficient number, since it is larger than the sum of its proper divisors (13718737).

138329257 is a wasteful number, since it uses less digits than its factorization.

138329257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143239 (or 1143228 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 138329257 is about 11761.3458838689. The cubic root of 138329257 is about 517.1755854485.

The spelling of 138329257 in words is "one hundred thirty-eight million, three hundred twenty-nine thousand, two hundred fifty-seven".