138658911 has 8 divisors (see below), whose sum is σ = 185019264. Its totient is φ = 92368920.

The previous prime is 138658859. The next prime is 138658937. The reversal of 138658911 is 119856831.

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

It is not a de Polignac number, because 138658911 - 2⁶ = 138658847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138658951) 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 7 ways as a sum of consecutive naturals, for example, 12805 + ... + 21006.

It is an arithmetic number, because the mean of its divisors is an integer number (23127408).

Almost surely, 2^138658911 is an apocalyptic number.

138658911 is a deficient number, since it is larger than the sum of its proper divisors (46360353).

138658911 is a wasteful number, since it uses less digits than its factorization.

138658911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35181.

The product of its digits is 51840, while the sum is 42.

The square root of 138658911 is about 11775.3518418772. The cubic root of 138658911 is about 517.5860885042.

The spelling of 138658911 in words is "one hundred thirty-eight million, six hundred fifty-eight thousand, nine hundred eleven".