18809285 has 16 divisors (see below), whose sum is σ = 25695360. Its totient is φ = 13083840.

The previous prime is 18809269. The next prime is 18809291. The reversal of 18809285 is 58290881.

It is not a de Polignac number, because 18809285 - 2⁴ = 18809269 is a prime.

It is a super-2 number, since 2×18809285² = 707578404422450, which contains 22 as substring.

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, 6170 + ... + 8699.

It is an arithmetic number, because the mean of its divisors is an integer number (1605960).

Almost surely, 2^18809285 is an apocalyptic number.

It is an amenable number.

18809285 is a deficient number, since it is larger than the sum of its proper divisors (6886075).

18809285 is a wasteful number, since it uses less digits than its factorization.

18809285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14908.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 18809285 is about 4336.9672583500. The cubic root of 18809285 is about 265.9443464324.

The spelling of 18809285 in words is "eighteen million, eight hundred nine thousand, two hundred eighty-five".