138260205 has 12 divisors (see below), whose sum is σ = 239651100. Its totient is φ = 73738752.

The previous prime is 138260183. The next prime is 138260209. The reversal of 138260205 is 502062831.

It can be written as a sum of positive squares in 2 ways, for example, as 56881764 + 81378441 = 7542^2 + 9021^2 .

It is not a de Polignac number, because 138260205 - 2⁵ = 138260173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138260209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1536180 + ... + 1536269.

It is an arithmetic number, because the mean of its divisors is an integer number (19970925).

Almost surely, 2^138260205 is an apocalyptic number.

138260205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138260205 is a deficient number, since it is larger than the sum of its proper divisors (101390895).

138260205 is a wasteful number, since it uses less digits than its factorization.

138260205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072460 (or 3072457 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 138260205 is about 11758.4099690392. The cubic root of 138260205 is about 517.0895155569.

The spelling of 138260205 in words is "one hundred thirty-eight million, two hundred sixty thousand, two hundred five".