8442178209 has 16 divisors (see below), whose sum is σ = 12546397440. Its totient is φ = 5610358800.

The previous prime is 8442178187. The next prime is 8442178219. The reversal of 8442178209 is 9028712448.

It is not a de Polignac number, because 8442178209 - 2⁵ = 8442178177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8442178219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484617 + ... + 501734.

It is an arithmetic number, because the mean of its divisors is an integer number (784149840).

Almost surely, 2^8442178209 is an apocalyptic number.

It is an amenable number.

8442178209 is a deficient number, since it is larger than the sum of its proper divisors (4104219231).

8442178209 is a wasteful number, since it uses less digits than its factorization.

8442178209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986677 (or 986671 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 8442178209 is about 91881.3267699156. The cubic root of 8442178209 is about 2036.1893981265.

The spelling of 8442178209 in words is "eight billion, four hundred forty-two million, one hundred seventy-eight thousand, two hundred nine".