16530385 has 8 divisors (see below), whose sum is σ = 19895400. Its totient is φ = 13185024.

The previous prime is 16530383. The next prime is 16530389. The reversal of 16530385 is 58303561.

It can be written as a sum of positive squares in 4 ways, for example, as 7745089 + 8785296 = 2783^2 + 2964^2 .

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 16530385 - 2¹ = 16530383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16530383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2992 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (2486925).

Almost surely, 2^16530385 is an apocalyptic number.

It is an amenable number.

16530385 is a deficient number, since it is larger than the sum of its proper divisors (3365015).

16530385 is an equidigital number, since it uses as much as digits as its factorization.

16530385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9827.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 16530385 is about 4065.7576169762. The cubic root of 16530385 is about 254.7383449619.

The spelling of 16530385 in words is "sixteen million, five hundred thirty thousand, three hundred eighty-five".