4509999 has 20 divisors (see below), whose sum is σ = 7257096. Its totient is φ = 2774736.

The previous prime is 4509997. The next prime is 4510021. The reversal of 4509999 is 9999054.

It is a happy number.

It is not a de Polignac number, because 4509999 - 2¹ = 4509997 is a prime.

4509999 is a modest number, since divided by 9999 gives 450 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4509997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1089 + ... + 3194.

Almost surely, 2^4509999 is an apocalyptic number.

4509999 is a deficient number, since it is larger than the sum of its proper divisors (2747097).

4509999 is a wasteful number, since it uses less digits than its factorization.

4509999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308 (or 4299 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 4509999 is about 2123.6758227187. The cubic root of 4509999 is about 165.2185533591.

The spelling of 4509999 in words is "four million, five hundred nine thousand, nine hundred ninety-nine".