18136223 has 12 divisors (see below), whose sum is σ = 21826440. Its totient is φ = 15008112.

The previous prime is 18136211. The next prime is 18136243. The reversal of 18136223 is 32263181.

It is not a de Polignac number, because 18136223 - 2⁴ = 18136207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18136192 and 18136201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18136243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4961 + ... + 7802.

It is an arithmetic number, because the mean of its divisors is an integer number (1818870).

Almost surely, 2^18136223 is an apocalyptic number.

18136223 is a deficient number, since it is larger than the sum of its proper divisors (3690217).

18136223 is a wasteful number, since it uses less digits than its factorization.

18136223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12806 (or 12799 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 18136223 is about 4258.6644620115. The cubic root of 18136223 is about 262.7335994649.

The spelling of 18136223 in words is "eighteen million, one hundred thirty-six thousand, two hundred twenty-three".