8217440449 has 4 divisors (see below), whose sum is σ = 8244207664. Its totient is φ = 8190673236.

The previous prime is 8217440447. The next prime is 8217440489. The reversal of 8217440449 is 9440447128.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8217440449 - 2¹ = 8217440447 is a prime.

It is a super-2 number, since 2×8217440449² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8217440447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13383147 + ... + 13383760.

It is an arithmetic number, because the mean of its divisors is an integer number (2061051916).

Almost surely, 2^8217440449 is an apocalyptic number.

It is an amenable number.

8217440449 is a deficient number, since it is larger than the sum of its proper divisors (26767215).

8217440449 is a wasteful number, since it uses less digits than its factorization.

8217440449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26767214.

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 8217440449 is about 90650.0990016007. The cubic root of 8217440449 is about 2017.9583044371.

The spelling of 8217440449 in words is "eight billion, two hundred seventeen million, four hundred forty thousand, four hundred forty-nine".