16197220 has 24 divisors (see below), whose sum is σ = 36631224. Its totient is φ = 5980416.

The previous prime is 16197193. The next prime is 16197229. The reversal of 16197220 is 2279161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20736 + 16176484 = 144^2 + 4022^2 .

It is not an unprimeable number, because it can be changed into a prime (16197229) 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 7 ways as a sum of consecutive naturals, for example, 30889 + ... + 31408.

It is an arithmetic number, because the mean of its divisors is an integer number (1526301).

Almost surely, 2^16197220 is an apocalyptic number.

16197220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16197220 is an abundant number, since it is smaller than the sum of its proper divisors (20434004).

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

16197220 is a wasteful number, since it uses less digits than its factorization.

16197220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62319 (or 62317 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 16197220 is about 4024.5769964060. The cubic root of 16197220 is about 253.0153250415.

The spelling of 16197220 in words is "sixteen million, one hundred ninety-seven thousand, two hundred twenty".