445840 has 20 divisors (see below), whose sum is σ = 1036764. Its totient is φ = 178304.

The previous prime is 445829. The next prime is 445847. The reversal of 445840 is 48544.

It can be written as a sum of positive squares in 2 ways, for example, as 76176 + 369664 = 276^2 + 608^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (445847) by changing a digit.

445840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2707 + ... + 2866.

2⁴⁴⁵⁸⁴⁰ is an apocalyptic number.

445840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

445840 is an abundant number, since it is smaller than the sum of its proper divisors (590924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

445840 is a wasteful number, since it uses less digits than its factorization.

445840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5586 (or 5580 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 445840 is about 667.7125129874. The cubic root of 445840 is about 76.3940749953.

The spelling of 445840 in words is "four hundred forty-five thousand, eight hundred forty".