16866444 has 48 divisors (see below), whose sum is σ = 45248000. Its totient is φ = 4790016.

The previous prime is 16866427. The next prime is 16866491. The reversal of 16866444 is 44466861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16212 + ... + 17220.

Almost surely, 2^16866444 is an apocalyptic number.

16866444 is a gapful number since it is divisible by the number (14) 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 16866444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22624000).

16866444 is an abundant number, since it is smaller than the sum of its proper divisors (28381556).

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

16866444 is a wasteful number, since it uses less digits than its factorization.

16866444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1220 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 16866444 is about 4106.8776460956. The cubic root of 16866444 is about 256.4530348828.

The spelling of 16866444 in words is "sixteen million, eight hundred sixty-six thousand, four hundred forty-four".