16320385 has 4 divisors (see below), whose sum is σ = 19584468. Its totient is φ = 13056304.

The previous prime is 16320371. The next prime is 16320401. The reversal of 16320385 is 58302361.

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 8020224 + 8300161 = 2832^2 + 2881^2 .

It is a cyclic number.

It is not a de Polignac number, because 16320385 - 2⁷ = 16320257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1632034 + ... + 1632043.

It is an arithmetic number, because the mean of its divisors is an integer number (4896117).

Almost surely, 2^16320385 is an apocalyptic number.

It is an amenable number.

16320385 is a deficient number, since it is larger than the sum of its proper divisors (3264083).

16320385 is an equidigital number, since it uses as much as digits as its factorization.

16320385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264082.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 16320385 is about 4039.8496259143. The cubic root of 16320385 is about 253.6550228161.

The spelling of 16320385 in words is "sixteen million, three hundred twenty thousand, three hundred eighty-five".