138329305 has 4 divisors (see below), whose sum is σ = 165995172. Its totient is φ = 110663440.

The previous prime is 138329299. The next prime is 138329341. The reversal of 138329305 is 503923831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503923831 = 37 ⋅13619563.

It can be written as a sum of positive squares in 2 ways, for example, as 98247744 + 40081561 = 9912^2 + 6331^2 .

It is not a de Polignac number, because 138329305 - 2¹⁷ = 138198233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13832926 + ... + 13832935.

It is an arithmetic number, because the mean of its divisors is an integer number (41498793).

Almost surely, 2^138329305 is an apocalyptic number.

It is an amenable number.

138329305 is a deficient number, since it is larger than the sum of its proper divisors (27665867).

138329305 is an equidigital number, since it uses as much as digits as its factorization.

138329305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27665866.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 138329305 is about 11761.3479244515. The cubic root of 138329305 is about 517.1756452682.

The spelling of 138329305 in words is "one hundred thirty-eight million, three hundred twenty-nine thousand, three hundred five".