999445 has 4 divisors (see below), whose sum is σ = 1199340. Its totient is φ = 799552.

The previous prime is 999437. The next prime is 999451. The reversal of 999445 is 544999.

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 323761 + 675684 = 569^2 + 822^2 .

It is a cyclic number.

It is not a de Polignac number, because 999445 - 2³ = 999437 is a prime.

999445 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 999398 and 999407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99940 + ... + 99949.

It is an arithmetic number, because the mean of its divisors is an integer number (299835).

2⁹⁹⁹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

999445 is a deficient number, since it is larger than the sum of its proper divisors (199895).

999445 is a wasteful number, since it uses less digits than its factorization.

999445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199894.

The product of its digits is 58320, while the sum is 40.

The square root of 999445 is about 999.7224614862. The cubic root of 999445 is about 99.9814965764.

It can be divided in two parts, 999 and 445, that added together give a square (1444 = 38²).

The spelling of 999445 in words is "nine hundred ninety-nine thousand, four hundred forty-five".