138099208 has 16 divisors (see below), whose sum is σ = 278854380. Its totient is φ = 63738048.

The previous prime is 138099197. The next prime is 138099209. The reversal of 138099208 is 802990831.

It can be written as a sum of positive squares in 2 ways, for example, as 104898564 + 33200644 = 10242^2 + 5762^2 .

It is not an unprimeable number, because it can be changed into a prime (138099209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663835 + ... + 664042.

Almost surely, 2^138099208 is an apocalyptic number.

It is an amenable number.

138099208 is an abundant number, since it is smaller than the sum of its proper divisors (140755172).

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

138099208 is a wasteful number, since it uses less digits than its factorization.

138099208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327896 (or 1327892 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 138099208 is about 11751.5619387382. The cubic root of 138099208 is about 516.8887294255. Note that the first 3 decimals are identical.

The spelling of 138099208 in words is "one hundred thirty-eight million, ninety-nine thousand, two hundred eight".