18426685 has 4 divisors (see below), whose sum is σ = 22112028. Its totient is φ = 14741344.

The previous prime is 18426673. The next prime is 18426761. The reversal of 18426685 is 58662481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8173881 + 10252804 = 2859^2 + 3202^2 .

It is a cyclic number.

It is not a de Polignac number, because 18426685 - 2⁹ = 18426173 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 1842664 + ... + 1842673.

It is an arithmetic number, because the mean of its divisors is an integer number (5528007).

Almost surely, 2^18426685 is an apocalyptic number.

It is an amenable number.

18426685 is a deficient number, since it is larger than the sum of its proper divisors (3685343).

18426685 is an equidigital number, since it uses as much as digits as its factorization.

18426685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685342.

The product of its digits is 92160, while the sum is 40.

The square root of 18426685 is about 4292.6314773109. The cubic root of 18426685 is about 264.1287872170.

The spelling of 18426685 in words is "eighteen million, four hundred twenty-six thousand, six hundred eighty-five".