16397563 has 24 divisors (see below), whose sum is σ = 20659968. Its totient is φ = 12740832.

The previous prime is 16397539. The next prime is 16397567. The reversal of 16397563 is 36579361.

It is not a de Polignac number, because 16397563 - 2¹⁷ = 16266491 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

Its product of digits (102060) is a multiple of the sum of its prime divisors (270).

It is not an unprimeable number, because it can be changed into a prime (16397567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98106 + ... + 98272.

It is an arithmetic number, because the mean of its divisors is an integer number (860832).

Almost surely, 2^16397563 is an apocalyptic number.

16397563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16397563 is a deficient number, since it is larger than the sum of its proper divisors (4262405).

16397563 is a wasteful number, since it uses less digits than its factorization.

16397563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 270 counting only the distinct ones).

The product of its digits is 102060, while the sum is 40.

The square root of 16397563 is about 4049.3904479563. The cubic root of 16397563 is about 254.0542333612.

The spelling of 16397563 in words is "sixteen million, three hundred ninety-seven thousand, five hundred sixty-three".