138538805 has 8 divisors (see below), whose sum is σ = 166320000. Its totient is φ = 110782096.

The previous prime is 138538801. The next prime is 138538853. The reversal of 138538805 is 508835831.

138538805 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 138538805 - 2² = 138538801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138538801) 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, 10376 + ... + 19614.

It is an arithmetic number, because the mean of its divisors is an integer number (20790000).

Almost surely, 2^138538805 is an apocalyptic number.

It is an amenable number.

138538805 is a deficient number, since it is larger than the sum of its proper divisors (27781195).

138538805 is an equidigital number, since it uses as much as digits as its factorization.

138538805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12243.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 138538805 is about 11770.2508469446. The cubic root of 138538805 is about 517.4366014114.

The spelling of 138538805 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, eight hundred five".