138037791 has 4 divisors (see below), whose sum is σ = 184050392. Its totient is φ = 92025192.

The previous prime is 138037771. The next prime is 138037799. The reversal of 138037791 is 197730831.

It is a happy number.

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

It is not a de Polignac number, because 138037791 - 2⁹ = 138037279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138037799) 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, 23006296 + ... + 23006301.

It is an arithmetic number, because the mean of its divisors is an integer number (46012598).

Almost surely, 2^138037791 is an apocalyptic number.

138037791 is a deficient number, since it is larger than the sum of its proper divisors (46012601).

138037791 is an equidigital number, since it uses as much as digits as its factorization.

138037791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46012600.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 138037791 is about 11748.9485061430. The cubic root of 138037791 is about 516.8120925815.

The spelling of 138037791 in words is "one hundred thirty-eight million, thirty-seven thousand, seven hundred ninety-one".