449991 has 6 divisors (see below), whose sum is σ = 650000. Its totient is φ = 299988.

The previous prime is 449989. The next prime is 450001. The reversal of 449991 is 199944.

It is not a de Polignac number, because 449991 - 2¹ = 449989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 449991.

It is not an unprimeable number, because it can be changed into a prime (449921) 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 5 ways as a sum of consecutive naturals, for example, 24991 + ... + 25008.

2⁴⁴⁹⁹⁹¹ is an apocalyptic number.

449991 is a deficient number, since it is larger than the sum of its proper divisors (200009).

449991 is a wasteful number, since it uses less digits than its factorization.

449991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50005 (or 50002 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 449991 is about 670.8136850125. The cubic root of 449991 is about 76.6304323630.

Subtracting from 449991 its reverse (199944), we obtain a cube (250047 = 63³).

The spelling of 449991 in words is "four hundred forty-nine thousand, nine hundred ninety-one".