449907021 has 16 divisors (see below), whose sum is σ = 667368000. Its totient is φ = 299560464.

The previous prime is 449907019. The next prime is 449907047. The reversal of 449907021 is 120709944.

It is not a de Polignac number, because 449907021 - 2¹ = 449907019 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (449907721) 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, 12255 + ... + 32403.

It is an arithmetic number, because the mean of its divisors is an integer number (41710500).

Almost surely, 2^449907021 is an apocalyptic number.

It is an amenable number.

449907021 is a deficient number, since it is larger than the sum of its proper divisors (217460979).

449907021 is a wasteful number, since it uses less digits than its factorization.

449907021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20985 (or 20979 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 449907021 is about 21211.0117863340. The cubic root of 449907021 is about 766.2566504731.

The spelling of 449907021 in words is "four hundred forty-nine million, nine hundred seven thousand, twenty-one".