138209041 has 4 divisors (see below), whose sum is σ = 142974900. Its totient is φ = 133443184.

The previous prime is 138209039. The next prime is 138209063. The reversal of 138209041 is 140902831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45279441 + 92929600 = 6729^2 + 9640^2 .

It is a cyclic number.

It is not a de Polignac number, because 138209041 - 2¹ = 138209039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138209341) 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 3 ways as a sum of consecutive naturals, for example, 2382886 + ... + 2382943.

It is an arithmetic number, because the mean of its divisors is an integer number (35743725).

Almost surely, 2^138209041 is an apocalyptic number.

It is an amenable number.

138209041 is a deficient number, since it is larger than the sum of its proper divisors (4765859).

138209041 is an equidigital number, since it uses as much as digits as its factorization.

138209041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4765858.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 138209041 is about 11756.2341334290. The cubic root of 138209041 is about 517.0257236844.

The spelling of 138209041 in words is "one hundred thirty-eight million, two hundred nine thousand, forty-one".