16320397 has 4 divisors (see below), whose sum is σ = 16329600. Its totient is φ = 16311196.

The previous prime is 16320371. The next prime is 16320401. The reversal of 16320397 is 79302361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16320397 - 2¹⁵ = 16287629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16320097) by changing a digit.

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, 1003 + ... + 5800.

It is an arithmetic number, because the mean of its divisors is an integer number (4082400).

Almost surely, 2^16320397 is an apocalyptic number.

It is an amenable number.

16320397 is a deficient number, since it is larger than the sum of its proper divisors (9203).

16320397 is an equidigital number, since it uses as much as digits as its factorization.

16320397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9202.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 16320397 is about 4039.8511111178. The cubic root of 16320397 is about 253.6550849849.

The spelling of 16320397 in words is "sixteen million, three hundred twenty thousand, three hundred ninety-seven".