445405823 has 4 divisors (see below), whose sum is σ = 446727840. Its totient is φ = 444083808.

The previous prime is 445405811. The next prime is 445405843. The reversal of 445405823 is 328504544.

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 445405823 - 2¹² = 445401727 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 (445405843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660503 + ... + 661176.

It is an arithmetic number, because the mean of its divisors is an integer number (111681960).

Almost surely, 2^445405823 is an apocalyptic number.

445405823 is a deficient number, since it is larger than the sum of its proper divisors (1322017).

445405823 is a wasteful number, since it uses less digits than its factorization.

445405823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322016.

The product of its (nonzero) digits is 76800, while the sum is 35.

The square root of 445405823 is about 21104.6398453042. The cubic root of 445405823 is about 763.6926839572.

The spelling of 445405823 in words is "four hundred forty-five million, four hundred five thousand, eight hundred twenty-three".