8138216 has 8 divisors (see below), whose sum is σ = 15259170. Its totient is φ = 4069104.

The previous prime is 8138209. The next prime is 8138219. The reversal of 8138216 is 6128318.

It can be written as a sum of positive squares in only one way, i.e., 5428900 + 2709316 = 2330^2 + 1646^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (8138219) 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 as a sum of consecutive naturals, namely, 508631 + ... + 508646.

Almost surely, 2^8138216 is an apocalyptic number.

It is an amenable number.

8138216 is a deficient number, since it is larger than the sum of its proper divisors (7120954).

8138216 is a wasteful number, since it uses less digits than its factorization.

8138216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017283 (or 1017279 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 8138216 is about 2852.7558605671. The cubic root of 8138216 is about 201.1452297275.

The spelling of 8138216 in words is "eight million, one hundred thirty-eight thousand, two hundred sixteen".