138003909 has 32 divisors (see below), whose sum is σ = 206115840. Its totient is φ = 81715200.

The previous prime is 138003881. The next prime is 138003911. The reversal of 138003909 is 909300831.

It is not a de Polignac number, because 138003909 - 2⁷ = 138003781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138003909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138003959) 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 31 ways as a sum of consecutive naturals, for example, 63757 + ... + 65885.

It is an arithmetic number, because the mean of its divisors is an integer number (6441120).

Almost surely, 2^138003909 is an apocalyptic number.

It is an amenable number.

138003909 is a deficient number, since it is larger than the sum of its proper divisors (68111931).

138003909 is a wasteful number, since it uses less digits than its factorization.

138003909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 138003909 is about 11747.5065013815. The cubic root of 138003909 is about 516.7698044997.

The spelling of 138003909 in words is "one hundred thirty-eight million, three thousand, nine hundred nine".