18031223 has 8 divisors (see below), whose sum is σ = 20734848. Its totient is φ = 15359544.

The previous prime is 18031217. The next prime is 18031249. The reversal of 18031223 is 32213081.

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

It is a cyclic number.

It is not a de Polignac number, because 18031223 - 2⁸ = 18030967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18031195 and 18031204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18031253) 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, 6761 + ... + 9042.

It is an arithmetic number, because the mean of its divisors is an integer number (2591856).

Almost surely, 2^18031223 is an apocalyptic number.

18031223 is a deficient number, since it is larger than the sum of its proper divisors (2703625).

18031223 is a wasteful number, since it uses less digits than its factorization.

18031223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15973.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 18031223 is about 4246.3187586426. The cubic root of 18031223 is about 262.2255841268.

The spelling of 18031223 in words is "eighteen million, thirty-one thousand, two hundred twenty-three".