449991817 has 16 divisors (see below), whose sum is σ = 508928832. Its totient is φ = 394269120.

The previous prime is 449991797. The next prime is 449991863. The reversal of 449991817 is 718199944.

It is a cyclic number.

It is not a de Polignac number, because 449991817 - 2¹⁵ = 449959049 is a prime.

It is a super-2 number, since 2×449991817² = 404985270733922978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (449991317) 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 15 ways as a sum of consecutive naturals, for example, 38383 + ... + 48715.

It is an arithmetic number, because the mean of its divisors is an integer number (31808052).

Almost surely, 2^449991817 is an apocalyptic number.

It is an amenable number.

449991817 is a deficient number, since it is larger than the sum of its proper divisors (58937015).

449991817 is a wasteful number, since it uses less digits than its factorization.

449991817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10488.

The product of its digits is 653184, while the sum is 52.

The square root of 449991817 is about 21213.0105595599. The cubic root of 449991817 is about 766.3047873950.

The spelling of 449991817 in words is "four hundred forty-nine million, nine hundred ninety-one thousand, eight hundred seventeen".