138905106 has 8 divisors (see below), whose sum is σ = 277810224. Its totient is φ = 46301700.

The previous prime is 138905083. The next prime is 138905183. The reversal of 138905106 is 601509831.

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

138905106 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11575420 + ... + 11575431.

It is an arithmetic number, because the mean of its divisors is an integer number (34726278).

Almost surely, 2^138905106 is an apocalyptic number.

138905106 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138905106 is a wasteful number, since it uses less digits than its factorization.

138905106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23150856.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 138905106 is about 11785.8010334470. The cubic root of 138905106 is about 517.8922396751.

The spelling of 138905106 in words is "one hundred thirty-eight million, nine hundred five thousand, one hundred six".