23218018 has 16 divisors (see below), whose sum is σ = 35961984. Its totient is φ = 11234160.

The previous prime is 23218001. The next prime is 23218043. The reversal of 23218018 is 81081232.

It is a junction number, because it is equal to n+sod(n) for n = 23217983 and 23218001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14871 + ... + 16357.

It is an arithmetic number, because the mean of its divisors is an integer number (2247624).

Almost surely, 2^23218018 is an apocalyptic number.

23218018 is a deficient number, since it is larger than the sum of its proper divisors (12743966).

23218018 is a wasteful number, since it uses less digits than its factorization.

23218018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 23218018 is about 4818.5078603236. The cubic root of 23218018 is about 285.2824449358.

The spelling of 23218018 in words is "twenty-three million, two hundred eighteen thousand, eighteen".