18412215 has 16 divisors (see below), whose sum is σ = 29528448. Its totient is φ = 9796896.

The previous prime is 18412201. The next prime is 18412237. The reversal of 18412215 is 51221481.

It is not a de Polignac number, because 18412215 - 2⁵ = 18412183 is a prime.

It is a super-2 number, since 2×18412215² = 678019322412450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6672 + ... + 9018.

It is an arithmetic number, because the mean of its divisors is an integer number (1845528).

Almost surely, 2^18412215 is an apocalyptic number.

18412215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18412215 is a deficient number, since it is larger than the sum of its proper divisors (11116233).

18412215 is a wasteful number, since it uses less digits than its factorization.

18412215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878.

The product of its digits is 640, while the sum is 24.

The square root of 18412215 is about 4290.9456999594. The cubic root of 18412215 is about 264.0596312726.

Adding to 18412215 its reverse (51221481), we get a palindrome (69633696).

The spelling of 18412215 in words is "eighteen million, four hundred twelve thousand, two hundred fifteen".