138847329 has 6 divisors (see below), whose sum is σ = 200557266. Its totient is φ = 92564880.

The previous prime is 138847327. The next prime is 138847337. The reversal of 138847329 is 923748831.

It can be written as a sum of positive squares in only one way, i.e., 107744400 + 31102929 = 10380^2 + 5577^2 .

It is not a de Polignac number, because 138847329 - 2¹ = 138847327 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138847327) 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, 7713732 + ... + 7713749.

It is an arithmetic number, because the mean of its divisors is an integer number (33426211).

Almost surely, 2^138847329 is an apocalyptic number.

It is an amenable number.

138847329 is a deficient number, since it is larger than the sum of its proper divisors (61709937).

138847329 is a wasteful number, since it uses less digits than its factorization.

138847329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15427487 (or 15427484 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 138847329 is about 11783.3496510967. The cubic root of 138847329 is about 517.8204246775.

The spelling of 138847329 in words is "one hundred thirty-eight million, eight hundred forty-seven thousand, three hundred twenty-nine".