138918805 has 8 divisors (see below), whose sum is σ = 169191072. Its totient is φ = 109476048.

The previous prime is 138918803. The next prime is 138918839. The reversal of 138918805 is 508819831.

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 138918805 - 2¹ = 138918803 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 (138918803) 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, 207007 + ... + 207676.

It is an arithmetic number, because the mean of its divisors is an integer number (21148884).

Almost surely, 2^138918805 is an apocalyptic number.

It is an amenable number.

138918805 is a deficient number, since it is larger than the sum of its proper divisors (30272267).

138918805 is an equidigital number, since it uses as much as digits as its factorization.

138918805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414755.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 138918805 is about 11786.3821845382. The cubic root of 138918805 is about 517.9092641815.

The spelling of 138918805 in words is "one hundred thirty-eight million, nine hundred eighteen thousand, eight hundred five".