4049509 has 4 divisors (see below), whose sum is σ = 4059820. Its totient is φ = 4039200.

The previous prime is 4049497. The next prime is 4049533. The reversal of 4049509 is 9059404.

It is a happy number.

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 3802500 + 247009 = 1950^2 + 497^2 .

It is a cyclic number.

It is not a de Polignac number, because 4049509 - 2¹⁵ = 4016741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4049569) 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 3 ways as a sum of consecutive naturals, for example, 4542 + ... + 5359.

It is an arithmetic number, because the mean of its divisors is an integer number (1014955).

Almost surely, 2^4049509 is an apocalyptic number.

It is an amenable number.

4049509 is a deficient number, since it is larger than the sum of its proper divisors (10311).

4049509 is an equidigital number, since it uses as much as digits as its factorization.

4049509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10310.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 4049509 is about 2012.3391861215. The cubic root of 4049509 is about 159.3923435694.

The spelling of 4049509 in words is "four million, forty-nine thousand, five hundred nine".