138579906 has 8 divisors (see below), whose sum is σ = 277159824. Its totient is φ = 46193300.

The previous prime is 138579851. The next prime is 138579941. The reversal of 138579906 is 609975831.

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

138579906 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11548320 + ... + 11548331.

It is an arithmetic number, because the mean of its divisors is an integer number (34644978).

Almost surely, 2^138579906 is an apocalyptic number.

138579906 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.

138579906 is a wasteful number, since it uses less digits than its factorization.

138579906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23096656.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 138579906 is about 11771.9966870536. The cubic root of 138579906 is about 517.4877665198.

The spelling of 138579906 in words is "one hundred thirty-eight million, five hundred seventy-nine thousand, nine hundred six".