18618385 has 16 divisors (see below), whose sum is σ = 24543360. Its totient is φ = 13495680.

The previous prime is 18618373. The next prime is 18618389. The reversal of 18618385 is 58381681.

It is not a de Polignac number, because 18618385 - 2¹⁵ = 18585617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18618389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2076 + ... + 6445.

It is an arithmetic number, because the mean of its divisors is an integer number (1533960).

Almost surely, 2^18618385 is an apocalyptic number.

It is an amenable number.

18618385 is a deficient number, since it is larger than the sum of its proper divisors (5924975).

18618385 is a wasteful number, since it uses less digits than its factorization.

18618385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8568.

The product of its digits is 46080, while the sum is 40.

The square root of 18618385 is about 4314.9026640238. The cubic root of 18618385 is about 265.0415741110.

The spelling of 18618385 in words is "eighteen million, six hundred eighteen thousand, three hundred eighty-five".