999999445 has 4 divisors (see below), whose sum is σ = 1199999340. Its totient is φ = 799999552.

The previous prime is 999999433. The next prime is 999999487. The reversal of 999999445 is 544999999.

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 683195044 + 316804401 = 26138^2 + 17799^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999445 - 2¹⁹ = 999475157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99999940 + ... + 99999949.

It is an arithmetic number, because the mean of its divisors is an integer number (299999835).

Almost surely, 2^999999445 is an apocalyptic number.

It is an amenable number.

999999445 is a deficient number, since it is larger than the sum of its proper divisors (199999895).

999999445 is a wasteful number, since it uses less digits than its factorization.

999999445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199999894.

The product of its digits is 42515280, while the sum is 67.

The square root of 999999445 is about 31622.7678263621. The cubic root of 999999445 is about 999.9998150000. Note that the first 3 decimals are identical.

The spelling of 999999445 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred forty-five".