18112215 has 32 divisors (see below), whose sum is σ = 32643072. Its totient is φ = 8496000.

The previous prime is 18112207. The next prime is 18112217. The reversal of 18112215 is 51221181.

It is not a de Polignac number, because 18112215 - 2³ = 18112207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18112191 and 18112200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18112217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3345 + ... + 6885.

It is an arithmetic number, because the mean of its divisors is an integer number (1020096).

Almost surely, 2^18112215 is an apocalyptic number.

18112215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18112215 is a deficient number, since it is larger than the sum of its proper divisors (14530857).

18112215 is a wasteful number, since it uses less digits than its factorization.

18112215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591.

The product of its digits is 160, while the sum is 21.

The square root of 18112215 is about 4255.8448045012. The cubic root of 18112215 is about 262.6176162270.

Adding to 18112215 its reverse (51221181), we get a palindrome (69333396).

The spelling of 18112215 in words is "eighteen million, one hundred twelve thousand, two hundred fifteen".