445905 has 24 divisors (see below), whose sum is σ = 803712. Its totient is φ = 237168.

The previous prime is 445891. The next prime is 445931. The reversal of 445905 is 509544.

It is not a de Polignac number, because 445905 - 2⁸ = 445649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1032 + ... + 1398.

It is an arithmetic number, because the mean of its divisors is an integer number (33488).

2⁴⁴⁵⁹⁰⁵ is an apocalyptic number.

445905 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

445905 is a deficient number, since it is larger than the sum of its proper divisors (357807).

445905 is an equidigital number, since it uses as much as digits as its factorization.

445905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 445905 is about 667.7611848558. The cubic root of 445905 is about 76.3977873686.

The spelling of 445905 in words is "four hundred forty-five thousand, nine hundred five".