18585013 has 4 divisors (see below), whose sum is σ = 19038348. Its totient is φ = 18131680.

The previous prime is 18584999. The next prime is 18585019. The reversal of 18585013 is 31058581.

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 5349969 + 13235044 = 2313^2 + 3638^2 .

It is a cyclic number.

It is not a de Polignac number, because 18585013 - 2⁵ = 18584981 is a prime.

It is a Smith number, since the sum of its digits (31) 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 not an unprimeable number, because it can be changed into a prime (18585019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226606 + ... + 226687.

It is an arithmetic number, because the mean of its divisors is an integer number (4759587).

Almost surely, 2^18585013 is an apocalyptic number.

It is an amenable number.

18585013 is a deficient number, since it is larger than the sum of its proper divisors (453335).

18585013 is an equidigital number, since it uses as much as digits as its factorization.

18585013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453334.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 18585013 is about 4311.0338667192. The cubic root of 18585013 is about 264.8831239677.

The spelling of 18585013 in words is "eighteen million, five hundred eighty-five thousand, thirteen".