16505223 has 8 divisors (see below), whose sum is σ = 25150848. Its totient is φ = 9431544.

The previous prime is 16505213. The next prime is 16505261. The reversal of 16505223 is 32250561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16505223 - 2¹² = 16501127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16505193 and 16505202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505213) 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, 392961 + ... + 393002.

It is an arithmetic number, because the mean of its divisors is an integer number (3143856).

Almost surely, 2^16505223 is an apocalyptic number.

16505223 is a deficient number, since it is larger than the sum of its proper divisors (8645625).

16505223 is an equidigital number, since it uses as much as digits as its factorization.

16505223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785973.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 16505223 is about 4062.6620583061. The cubic root of 16505223 is about 254.6090279252.

Adding to 16505223 its reverse (32250561), we get a palindrome (48755784).

The spelling of 16505223 in words is "sixteen million, five hundred five thousand, two hundred twenty-three".