138905835 has 16 divisors (see below), whose sum is σ = 222898176. Its totient is φ = 73866848.

The previous prime is 138905831. The next prime is 138905849. The reversal of 138905835 is 538509831.

It is a cyclic number.

It is not a de Polignac number, because 138905835 - 2² = 138905831 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138905831) 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 15 ways as a sum of consecutive naturals, for example, 8139 + ... + 18548.

It is an arithmetic number, because the mean of its divisors is an integer number (13931136).

Almost surely, 2^138905835 is an apocalyptic number.

138905835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138905835 is a deficient number, since it is larger than the sum of its proper divisors (83992341).

138905835 is a wasteful number, since it uses less digits than its factorization.

138905835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27042.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 138905835 is about 11785.8319604515. The cubic root of 138905835 is about 517.8931456720.

The spelling of 138905835 in words is "one hundred thirty-eight million, nine hundred five thousand, eight hundred thirty-five".