18240016 has 20 divisors (see below), whose sum is σ = 35739900. Its totient is φ = 9016832.

The previous prime is 18240007. The next prime is 18240023. The reversal of 18240016 is 61004281.

It can be written as a sum of positive squares in 2 ways, for example, as 4579600 + 13660416 = 2140^2 + 3696^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4981 + ... + 7828.

It is an arithmetic number, because the mean of its divisors is an integer number (1786995).

Almost surely, 2^18240016 is an apocalyptic number.

18240016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18240016 is a deficient number, since it is larger than the sum of its proper divisors (17499884).

18240016 is a wasteful number, since it uses less digits than its factorization.

18240016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12906 (or 12900 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18240016 is about 4270.8331739837. The cubic root of 18240016 is about 263.2338515786.

Adding to 18240016 its reverse (61004281), we get a palindrome (79244297).

The spelling of 18240016 in words is "eighteen million, two hundred forty thousand, sixteen".