18705285 has 12 divisors (see below), whose sum is σ = 32422572. Its totient is φ = 9976128.

The previous prime is 18705283. The next prime is 18705289. The reversal of 18705285 is 58250781.

It can be written as a sum of positive squares in 2 ways, for example, as 3448449 + 15256836 = 1857^2 + 3906^2 .

It is not a de Polignac number, because 18705285 - 2¹ = 18705283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705283) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 207792 + ... + 207881.

It is an arithmetic number, because the mean of its divisors is an integer number (2701881).

Almost surely, 2^18705285 is an apocalyptic number.

18705285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18705285 is a deficient number, since it is larger than the sum of its proper divisors (13717287).

18705285 is a wasteful number, since it uses less digits than its factorization.

18705285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415684 (or 415681 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 18705285 is about 4324.9606934630. The cubic root of 18705285 is about 265.4532885147.

The spelling of 18705285 in words is "eighteen million, seven hundred five thousand, two hundred eighty-five".