8640445 has 16 divisors (see below), whose sum is σ = 11409408. Its totient is φ = 6229440.

The previous prime is 8640439. The next prime is 8640451. The reversal of 8640445 is 5440468.

It is an interprime number because it is at equal distance from previous prime (8640439) and next prime (8640451).

It is not a de Polignac number, because 8640445 - 2¹⁷ = 8509373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6367 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (713088).

Almost surely, 2^8640445 is an apocalyptic number.

It is an amenable number.

8640445 is a deficient number, since it is larger than the sum of its proper divisors (2768963).

8640445 is a wasteful number, since it uses less digits than its factorization.

8640445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 8640445 is about 2939.4633864024. The cubic root of 8640445 is about 205.2006364078.

The spelling of 8640445 in words is "eight million, six hundred forty thousand, four hundred forty-five".