18215223 has 16 divisors (see below), whose sum is σ = 26549376. Its totient is φ = 11040480.

The previous prime is 18215221. The next prime is 18215227. The reversal of 18215223 is 32251281.

It is not a de Polignac number, because 18215223 - 2¹ = 18215221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18215193 and 18215202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18215221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 873 + ... + 6098.

It is an arithmetic number, because the mean of its divisors is an integer number (1659336).

Almost surely, 2^18215223 is an apocalyptic number.

18215223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18215223 is a deficient number, since it is larger than the sum of its proper divisors (8334153).

18215223 is a wasteful number, since it uses less digits than its factorization.

18215223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7054.

The product of its digits is 960, while the sum is 24.

The square root of 18215223 is about 4267.9295917341. The cubic root of 18215223 is about 263.1145293855.

The spelling of 18215223 in words is "eighteen million, two hundred fifteen thousand, two hundred twenty-three".