18042415 has 8 divisors (see below), whose sum is σ = 21925440. Its totient is φ = 14250912.

The previous prime is 18042361. The next prime is 18042463. The reversal of 18042415 is 51424081.

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 18042415 - 2¹⁷ = 17911343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18042415.

It is a congruent number.

It is an unprimeable number.

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, 22444 + ... + 23233.

It is an arithmetic number, because the mean of its divisors is an integer number (2740680).

Almost surely, 2^18042415 is an apocalyptic number.

18042415 is a deficient number, since it is larger than the sum of its proper divisors (3883025).

18042415 is an equidigital number, since it uses as much as digits as its factorization.

18042415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45761.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 18042415 is about 4247.6364015768. The cubic root of 18042415 is about 262.2798274751.

Adding to 18042415 its reverse (51424081), we get a palindrome (69466496).

The spelling of 18042415 in words is "eighteen million, forty-two thousand, four hundred fifteen".