16397705 has 4 divisors (see below), whose sum is σ = 19677252. Its totient is φ = 13118160.

The previous prime is 16397699. The next prime is 16397713. The reversal of 16397705 is 50779361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50779361 = 41 ⋅1238521.

It can be written as a sum of positive squares in 2 ways, for example, as 1713481 + 14684224 = 1309^2 + 3832^2 .

It is not a de Polignac number, because 16397705 - 2¹² = 16393609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1639766 + ... + 1639775.

It is an arithmetic number, because the mean of its divisors is an integer number (4919313).

Almost surely, 2^16397705 is an apocalyptic number.

It is an amenable number.

16397705 is a deficient number, since it is larger than the sum of its proper divisors (3279547).

16397705 is an equidigital number, since it uses as much as digits as its factorization.

16397705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279546.

The product of its (nonzero) digits is 39690, while the sum is 38.

The square root of 16397705 is about 4049.4079814215. The cubic root of 16397705 is about 254.0549667141.

The spelling of 16397705 in words is "sixteen million, three hundred ninety-seven thousand, seven hundred five".