138112209 has 12 divisors (see below), whose sum is σ = 206884496. Its totient is φ = 92074644.

The previous prime is 138112201. The next prime is 138112237. The reversal of 138112209 is 902211831.

138112209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138112209 - 2³ = 138112201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138112201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283939 + ... + 284424.

Almost surely, 2^138112209 is an apocalyptic number.

It is an amenable number.

138112209 is a deficient number, since it is larger than the sum of its proper divisors (68772287).

138112209 is an frugal number, since it uses more digits than its factorization.

138112209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568378 (or 568366 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 138112209 is about 11752.1150862302. The cubic root of 138112209 is about 516.9049493097.

The spelling of 138112209 in words is "one hundred thirty-eight million, one hundred twelve thousand, two hundred nine".