138641205 has 32 divisors (see below), whose sum is σ = 236438784. Its totient is φ = 69129216.

The previous prime is 138641179. The next prime is 138641219. The reversal of 138641205 is 502146831.

It is not a de Polignac number, because 138641205 - 2⁸ = 138640949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38304 + ... + 41766.

It is an arithmetic number, because the mean of its divisors is an integer number (7388712).

Almost surely, 2^138641205 is an apocalyptic number.

138641205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138641205 is a deficient number, since it is larger than the sum of its proper divisors (97797579).

138641205 is a wasteful number, since it uses less digits than its factorization.

138641205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 138641205 is about 11774.5999932057. The cubic root of 138641205 is about 517.5640565763.

The spelling of 138641205 in words is "one hundred thirty-eight million, six hundred forty-one thousand, two hundred five".