18684485 has 8 divisors (see below), whose sum is σ = 22452216. Its totient is φ = 14927040.

The previous prime is 18684473. The next prime is 18684493. The reversal of 18684485 is 58448681.

It can be written as a sum of positive squares in 4 ways, for example, as 9821956 + 8862529 = 3134^2 + 2977^2 .

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

It is not a de Polignac number, because 18684485 - 2⁴ = 18684469 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2255 + ... + 6515.

It is an arithmetic number, because the mean of its divisors is an integer number (2806527).

Almost surely, 2^18684485 is an apocalyptic number.

It is an amenable number.

18684485 is a deficient number, since it is larger than the sum of its proper divisors (3767731).

18684485 is an equidigital number, since it uses as much as digits as its factorization.

18684485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143.

The product of its digits is 245760, while the sum is 44.

The square root of 18684485 is about 4322.5553784769. Note that the first 3 decimals coincide. The cubic root of 18684485 is about 265.3548586458.

The spelling of 18684485 in words is "eighteen million, six hundred eighty-four thousand, four hundred eighty-five".