8440085321 has 4 divisors (see below), whose sum is σ = 8447981700. Its totient is φ = 8432188944.

The previous prime is 8440085273. The next prime is 8440085347. The reversal of 8440085321 is 1235800448.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2204772025 + 6235313296 = 46955^2 + 78964^2 .

It is a cyclic number.

It is not a de Polignac number, because 8440085321 - 2²² = 8435891017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8440015321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3946586 + ... + 3948723.

It is an arithmetic number, because the mean of its divisors is an integer number (2111995425).

Almost surely, 2^8440085321 is an apocalyptic number.

It is an amenable number.

8440085321 is a deficient number, since it is larger than the sum of its proper divisors (7896379).

8440085321 is a wasteful number, since it uses less digits than its factorization.

8440085321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7896378.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 8440085321 is about 91869.9369815828. The cubic root of 8440085321 is about 2036.0211213124.

Adding to 8440085321 its reverse (1235800448), we get a palindrome (9675885769).

The spelling of 8440085321 in words is "eight billion, four hundred forty million, eighty-five thousand, three hundred twenty-one".