138258109 has 36 divisors (see below), whose sum is σ = 166406940. Its totient is φ = 114576000.

The previous prime is 138258103. The next prime is 138258119. The reversal of 138258109 is 901852831.

It can be written as a sum of positive squares in 2 ways, for example, as 33605209 + 104652900 = 5797^2 + 10230^2 .

It is not a de Polignac number, because 138258109 - 2¹¹ = 138256061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138258103) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3372129 + ... + 3372169.

It is an arithmetic number, because the mean of its divisors is an integer number (4622415).

Almost surely, 2^138258109 is an apocalyptic number.

It is an amenable number.

138258109 is a deficient number, since it is larger than the sum of its proper divisors (28148831).

138258109 is a wasteful number, since it uses less digits than its factorization.

138258109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 138258109 is about 11758.3208410045. The cubic root of 138258109 is about 517.0869025488.

The spelling of 138258109 in words is "one hundred thirty-eight million, two hundred fifty-eight thousand, one hundred nine".