138181266 has 24 divisors (see below), whose sum is σ = 299817804. Its totient is φ = 45995040.

The previous prime is 138181261. The next prime is 138181279. The reversal of 138181266 is 662181831.

It can be written as a sum of positive squares in 2 ways, for example, as 136399041 + 1782225 = 11679^2 + 1335^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138181266.

It is not an unprimeable number, because it can be changed into a prime (138181261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8556 + ... + 18696.

Almost surely, 2^138181266 is an apocalyptic number.

138181266 is an abundant number, since it is smaller than the sum of its proper divisors (161636538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138181266 is a wasteful number, since it uses less digits than its factorization.

138181266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10906 (or 10903 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 138181266 is about 11755.0527859300. The cubic root of 138181266 is about 516.9910868969.

The spelling of 138181266 in words is "one hundred thirty-eight million, one hundred eighty-one thousand, two hundred sixty-six".