445589905 has 4 divisors (see below), whose sum is σ = 534707892. Its totient is φ = 356471920.

The previous prime is 445589869. The next prime is 445589909. The reversal of 445589905 is 509985544.

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 108243216 + 337346689 = 10404^2 + 18367^2 .

It is not a de Polignac number, because 445589905 - 2⁷ = 445589777 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445589909) 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, 44558986 + ... + 44558995.

It is an arithmetic number, because the mean of its divisors is an integer number (133676973).

Almost surely, 2^445589905 is an apocalyptic number.

It is an amenable number.

445589905 is a deficient number, since it is larger than the sum of its proper divisors (89117987).

445589905 is an equidigital number, since it uses as much as digits as its factorization.

445589905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89117986.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The square root of 445589905 is about 21109.0005684779. Note that the first 3 decimals coincide. The cubic root of 445589905 is about 763.7978784464.

The spelling of 445589905 in words is "four hundred forty-five million, five hundred eighty-nine thousand, nine hundred five".