16324409 has 4 divisors (see below), whose sum is σ = 16332516. Its totient is φ = 16316304.

The previous prime is 16324397. The next prime is 16324433. The reversal of 16324409 is 90442361.

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 9168784 + 7155625 = 3028^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 16324409 - 2¹² = 16320313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16324909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1547 + ... + 5919.

It is an arithmetic number, because the mean of its divisors is an integer number (4083129).

Almost surely, 2^16324409 is an apocalyptic number.

It is an amenable number.

16324409 is a deficient number, since it is larger than the sum of its proper divisors (8107).

16324409 is an equidigital number, since it uses as much as digits as its factorization.

16324409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 16324409 is about 4040.3476335583. The cubic root of 16324409 is about 253.6758684014.

The spelling of 16324409 in words is "sixteen million, three hundred twenty-four thousand, four hundred nine".