138902216 has 16 divisors (see below), whose sum is σ = 261145500. Its totient is φ = 69263424.

The previous prime is 138902213. The next prime is 138902263. The reversal of 138902216 is 612209831.

It can be written as a sum of positive squares in 2 ways, for example, as 124233316 + 14668900 = 11146^2 + 3830^2 .

It is not an unprimeable number, because it can be changed into a prime (138902213) 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 3 ways as a sum of consecutive naturals, for example, 20291 + ... + 26258.

Almost surely, 2^138902216 is an apocalyptic number.

It is an amenable number.

138902216 is a deficient number, since it is larger than the sum of its proper divisors (122243284).

138902216 is a wasteful number, since it uses less digits than its factorization.

138902216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46928 (or 46924 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 138902216 is about 11785.6784276511. The cubic root of 138902216 is about 517.8886479690. Note that the first 3 decimals are identical.

The spelling of 138902216 in words is "one hundred thirty-eight million, nine hundred two thousand, two hundred sixteen".