16397816 has 8 divisors (see below), whose sum is σ = 30745920. Its totient is φ = 8198904.

The previous prime is 16397813. The next prime is 16397831. The reversal of 16397816 is 61879361.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16397813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1024856 + ... + 1024871.

It is an arithmetic number, because the mean of its divisors is an integer number (3843240).

Almost surely, 2^16397816 is an apocalyptic number.

It is an amenable number.

16397816 is a deficient number, since it is larger than the sum of its proper divisors (14348104).

16397816 is a wasteful number, since it uses less digits than its factorization.

16397816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049733 (or 2049729 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 16397816 is about 4049.4216871055. The cubic root of 16397816 is about 254.0555399658.

It can be divided in two parts, 163 and 97816, that added together give a palindrome (97979).

The spelling of 16397816 in words is "sixteen million, three hundred ninety-seven thousand, eight hundred sixteen".