16623222 has 48 divisors (see below), whose sum is σ = 41776896. Its totient is φ = 4316400.

The previous prime is 16623209. The next prime is 16623247. The reversal of 16623222 is 22232661.

It is a super-2 number, since 2×16623222² = 552663019322568, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 16623192 and 16623201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3447 + ... + 6717.

It is an arithmetic number, because the mean of its divisors is an integer number (870352).

Almost surely, 2^16623222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16623222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20888448).

16623222 is an abundant number, since it is smaller than the sum of its proper divisors (25153674).

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

16623222 is a wasteful number, since it uses less digits than its factorization.

16623222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305 (or 3294 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 16623222 is about 4077.1585693961. The cubic root of 16623222 is about 255.2143372841.

Adding to 16623222 its reverse (22232661), we get a palindrome (38855883).

It can be divided in two parts, 1662 and 3222, that added together give a palindrome (4884).

The spelling of 16623222 in words is "sixteen million, six hundred twenty-three thousand, two hundred twenty-two".