445813 has 4 divisors (see below), whose sum is σ = 457900. Its totient is φ = 433728.

The previous prime is 445807. The next prime is 445829. The reversal of 445813 is 318544.

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 357604 + 88209 = 598^2 + 297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445853) 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, 5988 + ... + 6061.

It is an arithmetic number, because the mean of its divisors is an integer number (114475).

2⁴⁴⁵⁸¹³ is an apocalyptic number.

It is an amenable number.

445813 is a deficient number, since it is larger than the sum of its proper divisors (12087).

445813 is a wasteful number, since it uses less digits than its factorization.

445813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12086.

The product of its digits is 1920, while the sum is 25.

The square root of 445813 is about 667.6922943991. The cubic root of 445813 is about 76.3925328265.

The spelling of 445813 in words is "four hundred forty-five thousand, eight hundred thirteen".