16397005 has 4 divisors (see below), whose sum is σ = 19676412. Its totient is φ = 13117600.

The previous prime is 16396997. The next prime is 16397009. The reversal of 16397005 is 50079361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1674436 + 14722569 = 1294^2 + 3837^2 .

It is not a de Polignac number, because 16397005 - 2³ = 16396997 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16397009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1639696 + ... + 1639705.

It is an arithmetic number, because the mean of its divisors is an integer number (4919103).

Almost surely, 2^16397005 is an apocalyptic number.

It is an amenable number.

16397005 is a deficient number, since it is larger than the sum of its proper divisors (3279407).

16397005 is an equidigital number, since it uses as much as digits as its factorization.

16397005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279406.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 16397005 is about 4049.3215481115. The cubic root of 16397005 is about 254.0513515535.

The spelling of 16397005 in words is "sixteen million, three hundred ninety-seven thousand, five".