18645685 has 8 divisors (see below), whose sum is σ = 23691096. Its totient is φ = 14039040.

The previous prime is 18645673. The next prime is 18645689. The reversal of 18645685 is 58654681.

It can be written as a sum of positive squares in 4 ways, for example, as 8520561 + 10125124 = 2919^2 + 3182^2 .

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

It is not a de Polignac number, because 18645685 - 2¹¹ = 18643637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18645689) by changing a digit.

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, 109596 + ... + 109765.

It is an arithmetic number, because the mean of its divisors is an integer number (2961387).

Almost surely, 2^18645685 is an apocalyptic number.

It is an amenable number.

18645685 is a deficient number, since it is larger than the sum of its proper divisors (5045411).

18645685 is a wasteful number, since it uses less digits than its factorization.

18645685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219383.

The product of its digits is 230400, while the sum is 43.

The square root of 18645685 is about 4318.0649601413. The cubic root of 18645685 is about 265.1710536789.

The spelling of 18645685 in words is "eighteen million, six hundred forty-five thousand, six hundred eighty-five".