138085786 has 16 divisors (see below), whose sum is σ = 214294248. Its totient is φ = 66688000.

The previous prime is 138085769. The next prime is 138085789. The reversal of 138085786 is 687580831.

It can be written as a sum of positive squares in 4 ways, for example, as 136072225 + 2013561 = 11665^2 + 1419^2 .

It is not an unprimeable number, because it can be changed into a prime (138085789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55 + ... + 16618.

Almost surely, 2^138085786 is an apocalyptic number.

138085786 is a deficient number, since it is larger than the sum of its proper divisors (76208462).

138085786 is a wasteful number, since it uses less digits than its factorization.

138085786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16817.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 138085786 is about 11750.9908518388. The cubic root of 138085786 is about 516.8719832389.

The spelling of 138085786 in words is "one hundred thirty-eight million, eighty-five thousand, seven hundred eighty-six".