18243015 has 16 divisors (see below), whose sum is σ = 33358848. Its totient is φ = 8339616.

The previous prime is 18243013. The next prime is 18243019. The reversal of 18243015 is 51034281.

It is not a de Polignac number, because 18243015 - 2¹ = 18243013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86767 + ... + 86976.

It is an arithmetic number, because the mean of its divisors is an integer number (2084928).

Almost surely, 2^18243015 is an apocalyptic number.

18243015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18243015 is a deficient number, since it is larger than the sum of its proper divisors (15115833).

18243015 is a wasteful number, since it uses less digits than its factorization.

18243015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173758.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 18243015 is about 4271.1842620051. The cubic root of 18243015 is about 263.2482776452.

Adding to 18243015 its reverse (51034281), we get a palindrome (69277296).

The spelling of 18243015 in words is "eighteen million, two hundred forty-three thousand, fifteen".