16216730 has 32 divisors (see below), whose sum is σ = 30738960. Its totient is φ = 6151680.

The previous prime is 16216723. The next prime is 16216741. The reversal of 16216730 is 3761261.

It is a Cunningham number, because it is equal to 4027²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 5841889 + 10374841 = 2417^2 + 3221^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16216730.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14636 + ... + 15704.

Almost surely, 2^16216730 is an apocalyptic number.

16216730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16216730 is a deficient number, since it is larger than the sum of its proper divisors (14522230).

16216730 is a wasteful number, since it uses less digits than its factorization.

16216730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 16216730 is about 4027.0001241619. Note that the first 3 decimals coincide. The cubic root of 16216730 is about 253.1168722686.

Adding to 16216730 its reverse (3761261), we get a palindrome (19977991).

The spelling of 16216730 in words is "sixteen million, two hundred sixteen thousand, seven hundred thirty".