16197940 has 96 divisors (see below), whose sum is σ = 40497408. Its totient is φ = 5376000.

The previous prime is 16197917. The next prime is 16197947. The reversal of 16197940 is 4979161.

It is a self number, because there is not a number n which added to its sum of digits gives 16197940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16197947) 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, 228105 + ... + 228175.

It is an arithmetic number, because the mean of its divisors is an integer number (421848).

Almost surely, 2^16197940 is an apocalyptic number.

16197940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16197940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20248704).

16197940 is an abundant number, since it is smaller than the sum of its proper divisors (24299468).

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

16197940 is a wasteful number, since it uses less digits than its factorization.

16197940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 16197940 is about 4024.6664458064. Note that the first 3 decimals coincide. The cubic root of 16197940 is about 253.0190740045.

It can be divided in two parts, 1619 and 7940, that added together give a palindrome (9559).

The spelling of 16197940 in words is "sixteen million, one hundred ninety-seven thousand, nine hundred forty".