16397988 has 96 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 4777344.

The previous prime is 16397987. The next prime is 16397989. The reversal of 16397988 is 88979361.

It is an interprime number because it is at equal distance from previous prime (16397987) and next prime (16397989).

It is a self number, because there is not a number n which added to its sum of digits gives 16397988.

It is not an unprimeable number, because it can be changed into a prime (16397981) 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 31 ways as a sum of consecutive naturals, for example, 277903 + ... + 277961.

It is an arithmetic number, because the mean of its divisors is an integer number (453600).

Almost surely, 2^16397988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16397988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21772800).

16397988 is an abundant number, since it is smaller than the sum of its proper divisors (27147612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16397988 is a wasteful number, since it uses less digits than its factorization.

16397988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 159 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 16397988 is about 4049.4429246503. The cubic root of 16397988 is about 254.0564282426.

The spelling of 16397988 in words is "sixteen million, three hundred ninety-seven thousand, nine hundred eighty-eight".