138866466 has 16 divisors (see below), whose sum is σ = 282973824. Its totient is φ = 45415344.

The previous prime is 138866449. The next prime is 138866473. The reversal of 138866466 is 664668831.

It is a Curzon number.

It is an unprimeable number.

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, 218026 + ... + 218661.

It is an arithmetic number, because the mean of its divisors is an integer number (17685864).

Almost surely, 2^138866466 is an apocalyptic number.

138866466 is an abundant number, since it is smaller than the sum of its proper divisors (144107358).

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

138866466 is a wasteful number, since it uses less digits than its factorization.

138866466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436745.

The product of its digits is 995328, while the sum is 48.

The square root of 138866466 is about 11784.1616587689. The cubic root of 138866466 is about 517.8442135740.

The spelling of 138866466 in words is "one hundred thirty-eight million, eight hundred sixty-six thousand, four hundred sixty-six".