138647805 has 32 divisors (see below), whose sum is σ = 226873344. Its totient is φ = 72285696.

The previous prime is 138647783. The next prime is 138647809. The reversal of 138647805 is 508746831.

138647805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138647805 - 2⁸ = 138647549 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138647809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138567 + ... + 139563.

It is an arithmetic number, because the mean of its divisors is an integer number (7089792).

Almost surely, 2^138647805 is an apocalyptic number.

138647805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138647805 is a deficient number, since it is larger than the sum of its proper divisors (88225539).

138647805 is a wasteful number, since it uses less digits than its factorization.

138647805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 138647805 is about 11774.8802541682. The cubic root of 138647805 is about 517.5722693068.

The spelling of 138647805 in words is "one hundred thirty-eight million, six hundred forty-seven thousand, eight hundred five".