138046209 has 32 divisors (see below), whose sum is σ = 214306560. Its totient is φ = 77417472.

The previous prime is 138046201. The next prime is 138046213. The reversal of 138046209 is 902640831.

It is not a de Polignac number, because 138046209 - 2³ = 138046201 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138046209.

It is not an unprimeable number, because it can be changed into a prime (138046201) 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 31 ways as a sum of consecutive naturals, for example, 435319 + ... + 435635.

It is an arithmetic number, because the mean of its divisors is an integer number (6697080).

Almost surely, 2^138046209 is an apocalyptic number.

It is an amenable number.

138046209 is a deficient number, since it is larger than the sum of its proper divisors (76260351).

138046209 is a wasteful number, since it uses less digits than its factorization.

138046209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 138046209 is about 11749.3067455063. The cubic root of 138046209 is about 516.8225980036.

The spelling of 138046209 in words is "one hundred thirty-eight million, forty-six thousand, two hundred nine".