138205711 has 16 divisors (see below), whose sum is σ = 162505728. Its totient is φ = 115070400.

The previous prime is 138205703. The next prime is 138205729. The reversal of 138205711 is 117502831.

138205711 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 138205711 - 2³ = 138205703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138205711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138205511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74566 + ... + 76396.

It is an arithmetic number, because the mean of its divisors is an integer number (10156608).

Almost surely, 2^138205711 is an apocalyptic number.

138205711 is a deficient number, since it is larger than the sum of its proper divisors (24300017).

138205711 is a wasteful number, since it uses less digits than its factorization.

138205711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 138205711 is about 11756.0925055905. The cubic root of 138205711 is about 517.0215712559.

The spelling of 138205711 in words is "one hundred thirty-eight million, two hundred five thousand, seven hundred eleven".