9218139 has 16 divisors (see below), whose sum is σ = 14138112. Its totient is φ = 5233248.

The previous prime is 9218123. The next prime is 9218141. The reversal of 9218139 is 9318129.

It is not a de Polignac number, because 9218139 - 2⁴ = 9218123 is a prime.

9218139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9218119) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2077 + ... + 4769.

It is an arithmetic number, because the mean of its divisors is an integer number (883632).

Almost surely, 2^9218139 is an apocalyptic number.

9218139 is a deficient number, since it is larger than the sum of its proper divisors (4919973).

9218139 is a wasteful number, since it uses less digits than its factorization.

9218139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866.

The product of its digits is 3888, while the sum is 33.

The square root of 9218139 is about 3036.1388308179. The cubic root of 9218139 is about 209.6755306693.

The spelling of 9218139 in words is "nine million, two hundred eighteen thousand, one hundred thirty-nine".