16447 has 2 divisors, whose sum is σ = 16448. Its totient is φ = 16446.

The previous prime is 16433. The next prime is 16451. The reversal of 16447 is 74461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16447 - 2⁷ = 16319 is a prime.

It is a Chen prime.

16447 is a lucky number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8223 + 8224.

It is an arithmetic number, because the mean of its divisors is an integer number (8224).

16447 is a Friedman number, since it can be written as 64+4^7-1, using all its digits and the basic arithmetic operations.

2¹⁶⁴⁴⁷ is an apocalyptic number.

16447 is a deficient number, since it is larger than the sum of its proper divisors (1).

16447 is an equidigital number, since it uses as much as digits as its factorization.

16447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 22.

The square root of 16447 is about 128.2458576329. The cubic root of 16447 is about 25.4309293177.

The spelling of 16447 in words is "sixteen thousand, four hundred forty-seven".