16218944 has 56 divisors (see below), whose sum is σ = 37722048. Its totient is φ = 6773760.

The previous prime is 16218941. The next prime is 16218949. The reversal of 16218944 is 44981261.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16218941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17927 + ... + 18809.

It is an arithmetic number, because the mean of its divisors is an integer number (673608).

Almost surely, 2^16218944 is an apocalyptic number.

16218944 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 16218944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18861024).

16218944 is an abundant number, since it is smaller than the sum of its proper divisors (21503104).

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

16218944 is an equidigital number, since it uses as much as digits as its factorization.

16218944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 933 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 16218944 is about 4027.2750092339. The cubic root of 16218944 is about 253.1283907283.

The spelling of 16218944 in words is "sixteen million, two hundred eighteen thousand, nine hundred forty-four".