445538209 has 4 divisors (see below), whose sum is σ = 445645504. Its totient is φ = 445430916.

The previous prime is 445538189. The next prime is 445538213. The reversal of 445538209 is 902835544.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 445538209 - 2¹⁵ = 445505441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445538279) 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, 47157 + ... + 55810.

It is an arithmetic number, because the mean of its divisors is an integer number (111411376).

Almost surely, 2^445538209 is an apocalyptic number.

It is an amenable number.

445538209 is a deficient number, since it is larger than the sum of its proper divisors (107295).

445538209 is a wasteful number, since it uses less digits than its factorization.

445538209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107294.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 445538209 is about 21107.7760315956. The cubic root of 445538209 is about 763.7683394601.

The spelling of 445538209 in words is "four hundred forty-five million, five hundred thirty-eight thousand, two hundred nine".