16623 has 6 divisors (see below), whose sum is σ = 24024. Its totient is φ = 11076.

The previous prime is 16619. The next prime is 16631. The reversal of 16623 is 32661.

Added to its reverse (32661) it gives a square (49284 = 222²).

It is a happy number.

16623 is a `hidden beast` number, since 1 + 662 + 3 = 666.

16623 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16623 - 2² = 16619 is a prime.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 16596 and 16605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 915 + ... + 932.

It is an arithmetic number, because the mean of its divisors is an integer number (4004).

2¹⁶⁶²³ is an apocalyptic number.

16623 is a deficient number, since it is larger than the sum of its proper divisors (7401).

16623 is a wasteful number, since it uses less digits than its factorization.

16623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853 (or 1850 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 16623 is about 128.9302136817. The cubic root of 16623 is about 25.5213201166.

Adding to 16623 its sum of digits (18), we get a square (16641 = 129²).

Adding to 16623 its reverse (32661), we get a square (49284 = 222²).

The spelling of 16623 in words is "sixteen thousand, six hundred twenty-three".