18421115 has 8 divisors (see below), whose sum is σ = 23405760. Its totient is φ = 13869952.

The previous prime is 18421111. The next prime is 18421121. The reversal of 18421115 is 51112481.

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 18421115 - 2² = 18421111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18421111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108275 + ... + 108444.

It is an arithmetic number, because the mean of its divisors is an integer number (2925720).

Almost surely, 2^18421115 is an apocalyptic number.

18421115 is a deficient number, since it is larger than the sum of its proper divisors (4984645).

18421115 is a wasteful number, since it uses less digits than its factorization.

18421115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216741.

The product of its digits is 320, while the sum is 23.

The square root of 18421115 is about 4291.9826420898. The cubic root of 18421115 is about 264.1021710061.

Adding to 18421115 its reverse (51112481), we get a palindrome (69533596).

The spelling of 18421115 in words is "eighteen million, four hundred twenty-one thousand, one hundred fifteen".