18240015 has 16 divisors (see below), whose sum is σ = 29253600. Its totient is φ = 9704832.

The previous prime is 18240007. The next prime is 18240023. The reversal of 18240015 is 51004281.

It is an interprime number because it is at equal distance from previous prime (18240007) and next prime (18240023).

It is not a de Polignac number, because 18240015 - 2³ = 18240007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18239973 and 18240000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6441 + ... + 8829.

It is an arithmetic number, because the mean of its divisors is an integer number (1828350).

Almost surely, 2^18240015 is an apocalyptic number.

18240015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18240015 is a deficient number, since it is larger than the sum of its proper divisors (11013585).

18240015 is a wasteful number, since it uses less digits than its factorization.

18240015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18240015 is about 4270.8330569106. The cubic root of 18240015 is about 263.2338467680.

Adding to 18240015 its reverse (51004281), we get a palindrome (69244296).

The spelling of 18240015 in words is "eighteen million, two hundred forty thousand, fifteen".