445819 has 4 divisors (see below), whose sum is σ = 486360. Its totient is φ = 405280.

The previous prime is 445807. The next prime is 445829. The reversal of 445819 is 918544.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 445819 - 2⁷ = 445691 is a prime.

It is a super-2 number, since 2×445819² = 397509161522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20254 + ... + 20275.

It is an arithmetic number, because the mean of its divisors is an integer number (121590).

2⁴⁴⁵⁸¹⁹ is an apocalyptic number.

445819 is a deficient number, since it is larger than the sum of its proper divisors (40541).

445819 is a wasteful number, since it uses less digits than its factorization.

445819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40540.

The product of its digits is 5760, while the sum is 31.

The square root of 445819 is about 667.6967874717. The cubic root of 445819 is about 76.3928755360.

It can be divided in two parts, 44 and 5819, that multiplied together give a square (256036 = 506²).

The spelling of 445819 in words is "four hundred forty-five thousand, eight hundred nineteen".