16187220 has 144 divisors (see below), whose sum is σ = 58181760. Its totient is φ = 3564288.

The previous prime is 16187201. The next prime is 16187273. The reversal of 16187220 is 2278161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36319 + ... + 36761.

It is an arithmetic number, because the mean of its divisors is an integer number (404040).

Almost surely, 2^16187220 is an apocalyptic number.

16187220 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 16187220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29090880).

16187220 is an abundant number, since it is smaller than the sum of its proper divisors (41994540).

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

16187220 is a wasteful number, since it uses less digits than its factorization.

16187220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 16187220 is about 4023.3344380004. The cubic root of 16187220 is about 252.9632446201.

The spelling of 16187220 in words is "sixteen million, one hundred eighty-seven thousand, two hundred twenty".