16321385 has 8 divisors (see below), whose sum is σ = 19650120. Its totient is φ = 13014144.

The previous prime is 16321373. The next prime is 16321387. The reversal of 16321385 is 58312361.

It can be written as a sum of positive squares in 4 ways, for example, as 1545049 + 14776336 = 1243^2 + 3844^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16321385 - 2¹⁴ = 16305001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16321387) 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 7 ways as a sum of consecutive naturals, for example, 3650 + ... + 6779.

It is an arithmetic number, because the mean of its divisors is an integer number (2456265).

Almost surely, 2^16321385 is an apocalyptic number.

It is an amenable number.

16321385 is a deficient number, since it is larger than the sum of its proper divisors (3328735).

16321385 is a wasteful number, since it uses less digits than its factorization.

16321385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10747.

The product of its digits is 4320, while the sum is 29.

The square root of 16321385 is about 4039.9733910015. The cubic root of 16321385 is about 253.6602034504.

The spelling of 16321385 in words is "sixteen million, three hundred twenty-one thousand, three hundred eighty-five".