438213809 has 16 divisors (see below), whose sum is σ = 499374720. Its totient is φ = 380876160.

The previous prime is 438213803. The next prime is 438213859. The reversal of 438213809 is 908312834.

It is a cyclic number.

It is not a de Polignac number, because 438213809 - 2⁴ = 438213793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438213803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26189 + ... + 39525.

It is an arithmetic number, because the mean of its divisors is an integer number (31210920).

Almost surely, 2^438213809 is an apocalyptic number.

It is an amenable number.

438213809 is a deficient number, since it is larger than the sum of its proper divisors (61160911).

438213809 is a wasteful number, since it uses less digits than its factorization.

438213809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13480.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 438213809 is about 20933.5570078284. The cubic root of 438213809 is about 759.5598842596.

The spelling of 438213809 in words is "four hundred thirty-eight million, two hundred thirteen thousand, eight hundred nine".