16003218 has 96 divisors (see below), whose sum is σ = 41674752. Its totient is φ = 4007520.

The previous prime is 16003217. The next prime is 16003237. The reversal of 16003218 is 81230061.

It is a super-2 number, since 2×16003218² = 512205972711048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 16003194 and 16003203.

It is not an unprimeable number, because it can be changed into a prime (16003217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 238821 + ... + 238887.

It is an arithmetic number, because the mean of its divisors is an integer number (434112).

Almost surely, 2^16003218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16003218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20837376).

16003218 is an abundant number, since it is smaller than the sum of its proper divisors (25671534).

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

16003218 is a wasteful number, since it uses less digits than its factorization.

16003218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 16003218 is about 4000.4022297764. The cubic root of 16003218 is about 252.0011022879.

Adding to 16003218 its reverse (81230061), we get a palindrome (97233279).

The spelling of 16003218 in words is "sixteen million, three thousand, two hundred eighteen".