18888685 has 8 divisors (see below), whose sum is σ = 23279256. Its totient is φ = 14702400.

The previous prime is 18888671. The next prime is 18888691. The reversal of 18888685 is 58688881.

It can be written as a sum of positive squares in 4 ways, for example, as 1340964 + 17547721 = 1158^2 + 4189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18888685 - 2¹⁵ = 18855917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 50866 + ... + 51235.

It is an arithmetic number, because the mean of its divisors is an integer number (2909907).

Almost surely, 2^18888685 is an apocalyptic number.

It is an amenable number.

18888685 is a deficient number, since it is larger than the sum of its proper divisors (4390571).

18888685 is a wasteful number, since it uses less digits than its factorization.

18888685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102143.

The product of its digits is 983040, while the sum is 52.

The square root of 18888685 is about 4346.1114803926. Note that the first 3 decimals coincide. The cubic root of 18888685 is about 266.3180331188.

The spelling of 18888685 in words is "eighteen million, eight hundred eighty-eight thousand, six hundred eighty-five".