138031805 has 8 divisors (see below), whose sum is σ = 166179552. Its totient is φ = 110064528.

The previous prime is 138031801. The next prime is 138031813. The reversal of 138031805 is 508130831.

138031805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138031805 - 2² = 138031801 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 (138031801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43427 + ... + 46496.

It is an arithmetic number, because the mean of its divisors is an integer number (20772444).

Almost surely, 2^138031805 is an apocalyptic number.

It is an amenable number.

138031805 is a deficient number, since it is larger than the sum of its proper divisors (28147747).

138031805 is an equidigital number, since it uses as much as digits as its factorization.

138031805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90235.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 138031805 is about 11748.6937571800. The cubic root of 138031805 is about 516.8046219657.

The spelling of 138031805 in words is "one hundred thirty-eight million, thirty-one thousand, eight hundred five".