138216946 has 12 divisors (see below), whose sum is σ = 241174638. Its totient is φ = 59235792.

The previous prime is 138216937. The next prime is 138216977. The reversal of 138216946 is 649612831.

It can be written as a sum of positive squares in only one way, i.e., 137475625 + 741321 = 11725^2 + 861^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138216899 and 138216908.

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 5 ways as a sum of consecutive naturals, for example, 705091 + ... + 705286.

Almost surely, 2^138216946 is an apocalyptic number.

138216946 is a deficient number, since it is larger than the sum of its proper divisors (102957692).

138216946 is a wasteful number, since it uses less digits than its factorization.

138216946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410393 (or 1410386 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 138216946 is about 11756.5703332222. The cubic root of 138216946 is about 517.0355807589.

The spelling of 138216946 in words is "one hundred thirty-eight million, two hundred sixteen thousand, nine hundred forty-six".