18240285 has 64 divisors (see below), whose sum is σ = 36126720. Its totient is φ = 7672320.

The previous prime is 18240253. The next prime is 18240293. The reversal of 18240285 is 58204281.

It is not a de Polignac number, because 18240285 - 2⁵ = 18240253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81684 + ... + 81906.

It is an arithmetic number, because the mean of its divisors is an integer number (564480).

Almost surely, 2^18240285 is an apocalyptic number.

18240285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18240285 is a deficient number, since it is larger than the sum of its proper divisors (17886435).

18240285 is a wasteful number, since it uses less digits than its factorization.

18240285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 18240285 is about 4270.8646665517. The cubic root of 18240285 is about 263.2351456118.

It can be divided in two parts, 18240 and 285, that multiplied together give a square (5198400 = 2280²).

The spelling of 18240285 in words is "eighteen million, two hundred forty thousand, two hundred eighty-five".