16321705 has 16 divisors (see below), whose sum is σ = 20102544. Its totient is φ = 12718080.

The previous prime is 16321691. The next prime is 16321729. The reversal of 16321705 is 50712361.

16321705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 385641 + 15936064 = 621^2 + 3992^2 .

It is not a de Polignac number, because 16321705 - 2¹¹ = 16319657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16321705.

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, 35175 + ... + 35635.

It is an arithmetic number, because the mean of its divisors is an integer number (1256409).

Almost surely, 2^16321705 is an apocalyptic number.

It is an amenable number.

16321705 is a deficient number, since it is larger than the sum of its proper divisors (3780839).

16321705 is an equidigital number, since it uses as much as digits as its factorization.

16321705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 16321705 is about 4040.0129950286. The cubic root of 16321705 is about 253.6618612087.

The spelling of 16321705 in words is "sixteen million, three hundred twenty-one thousand, seven hundred five".