8444398865 has 64 divisors (see below), whose sum is σ = 12456198144. Its totient is φ = 5364292608.

The previous prime is 8444398861. The next prime is 8444398873. The reversal of 8444398865 is 5688934448.

It is a happy number.

It is not a de Polignac number, because 8444398865 - 2² = 8444398861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8444398861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13911392 + ... + 13911998.

It is an arithmetic number, because the mean of its divisors is an integer number (194628096).

Almost surely, 2^8444398865 is an apocalyptic number.

8444398865 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8444398865 is a deficient number, since it is larger than the sum of its proper divisors (4011799279).

8444398865 is a wasteful number, since it uses less digits than its factorization.

8444398865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its digits is 26542080, while the sum is 59.

The square root of 8444398865 is about 91893.4103459002. The cubic root of 8444398865 is about 2036.3679176067.

The spelling of 8444398865 in words is "eight billion, four hundred forty-four million, three hundred ninety-eight thousand, eight hundred sixty-five".