23155218 has 24 divisors (see below), whose sum is σ = 50476608. Its totient is φ = 7671192.

The previous prime is 23155217. The next prime is 23155247. The reversal of 23155218 is 81255132.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23155191 and 23155200.

It is not an unprimeable number, because it can be changed into a prime (23155213) 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, 846 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (2103192).

Almost surely, 2^23155218 is an apocalyptic number.

23155218 is an abundant number, since it is smaller than the sum of its proper divisors (27321390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23155218 is a wasteful number, since it uses less digits than its factorization.

23155218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878 (or 7875 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 23155218 is about 4811.9869077129. The cubic root of 23155218 is about 285.0250024233.

The spelling of 23155218 in words is "twenty-three million, one hundred fifty-five thousand, two hundred eighteen".