138260008 has 8 divisors (see below), whose sum is σ = 259237530. Its totient is φ = 69130000.

The previous prime is 138259999. The next prime is 138260021. The reversal of 138260008 is 800062831.

It can be written as a sum of positive squares in only one way, i.e., 113678244 + 24581764 = 10662^2 + 4958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 8641243 + ... + 8641258.

Almost surely, 2^138260008 is an apocalyptic number.

It is an amenable number.

138260008 is a deficient number, since it is larger than the sum of its proper divisors (120977522).

138260008 is a wasteful number, since it uses less digits than its factorization.

138260008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17282507 (or 17282503 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 138260008 is about 11758.4015920532. The cubic root of 138260008 is about 517.0892699652.

The spelling of 138260008 in words is "one hundred thirty-eight million, two hundred sixty thousand, eight".