16388797 has 4 divisors (see below), whose sum is σ = 16399900. Its totient is φ = 16377696.

The previous prime is 16388791. The next prime is 16388831. The reversal of 16388797 is 79788361.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6522916 + 9865881 = 2554^2 + 3141^2 .

It is a cyclic number.

It is not a de Polignac number, because 16388797 - 2³ = 16388789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16388797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16388791) 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, 2922 + ... + 6427.

It is an arithmetic number, because the mean of its divisors is an integer number (4099975).

Almost surely, 2^16388797 is an apocalyptic number.

It is an amenable number.

16388797 is a deficient number, since it is larger than the sum of its proper divisors (11103).

16388797 is an equidigital number, since it uses as much as digits as its factorization.

16388797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11102.

The product of its digits is 508032, while the sum is 49.

The square root of 16388797 is about 4048.3079181307. The cubic root of 16388797 is about 254.0089535356.

The spelling of 16388797 in words is "sixteen million, three hundred eighty-eight thousand, seven hundred ninety-seven".