4509865 has 4 divisors (see below), whose sum is σ = 5411844. Its totient is φ = 3607888.

The previous prime is 4509853. The next prime is 4509881. The reversal of 4509865 is 5689054.

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 683929 + 3825936 = 827^2 + 1956^2 .

It is a cyclic number.

It is not a de Polignac number, because 4509865 - 2⁷ = 4509737 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

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, 450982 + ... + 450991.

It is an arithmetic number, because the mean of its divisors is an integer number (1352961).

Almost surely, 2^4509865 is an apocalyptic number.

It is an amenable number.

4509865 is a deficient number, since it is larger than the sum of its proper divisors (901979).

4509865 is an equidigital number, since it uses as much as digits as its factorization.

4509865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901978.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 4509865 is about 2123.6442734130. The cubic root of 4509865 is about 165.2169170316.

The spelling of 4509865 in words is "four million, five hundred nine thousand, eight hundred sixty-five".