4238809 has 4 divisors (see below), whose sum is σ = 4244020. Its totient is φ = 4233600.

The previous prime is 4238807. The next prime is 4238813. The reversal of 4238809 is 9088324.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 685584 + 3553225 = 828^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 4238809 - 2¹ = 4238807 is a prime.

It is a Duffinian number.

4238809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4238807) 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 3 ways as a sum of consecutive naturals, for example, 1092 + ... + 3109.

It is an arithmetic number, because the mean of its divisors is an integer number (1061005).

Almost surely, 2^4238809 is an apocalyptic number.

It is an amenable number.

4238809 is a deficient number, since it is larger than the sum of its proper divisors (5211).

4238809 is a wasteful number, since it uses less digits than its factorization.

4238809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5210.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 4238809 is about 2058.8368075202. The cubic root of 4238809 is about 161.8382905980.

The spelling of 4238809 in words is "four million, two hundred thirty-eight thousand, eight hundred nine".