16516393 has 4 divisors (see below), whose sum is σ = 16962820. Its totient is φ = 16069968.

The previous prime is 16516387. The next prime is 16516417. The reversal of 16516393 is 39361561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39361561 = 593 ⋅66377.

It can be written as a sum of positive squares in 2 ways, for example, as 13446889 + 3069504 = 3667^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 16516393 - 2⁹ = 16515881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16516303) by changing a digit.

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, 223158 + ... + 223231.

It is an arithmetic number, because the mean of its divisors is an integer number (4240705).

Almost surely, 2^16516393 is an apocalyptic number.

It is an amenable number.

16516393 is a deficient number, since it is larger than the sum of its proper divisors (446427).

16516393 is an equidigital number, since it uses as much as digits as its factorization.

16516393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446426.

The product of its digits is 14580, while the sum is 34.

The square root of 16516393 is about 4064.0365401901. The cubic root of 16516393 is about 254.6664509910. Note that the first 3 decimals are identical.

The spelling of 16516393 in words is "sixteen million, five hundred sixteen thousand, three hundred ninety-three".