445609 has 6 divisors (see below), whose sum is σ = 458106. Its totient is φ = 433440.

The previous prime is 445597. The next prime is 445619. The reversal of 445609 is 906544.

It can be written as a sum of positive squares in only one way, i.e., 416025 + 29584 = 645^2 + 172^2 .

It is not a de Polignac number, because 445609 - 2⁹ = 445097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1729 + ... + 1969.

It is an arithmetic number, because the mean of its divisors is an integer number (76351).

2⁴⁴⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

445609 is a deficient number, since it is larger than the sum of its proper divisors (12497).

445609 is an equidigital number, since it uses as much as digits as its factorization.

445609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 445609 is about 667.5395119392. The cubic root of 445609 is about 76.3808788712.

The spelling of 445609 in words is "four hundred forty-five thousand, six hundred nine".