18818385 has 32 divisors (see below), whose sum is σ = 31715712. Its totient is φ = 9515520.

The previous prime is 18818383. The next prime is 18818399. The reversal of 18818385 is 58381881.

It is not a de Polignac number, because 18818385 - 2¹ = 18818383 is a prime.

It is a super-2 number, since 2×18818385² = 708263228016450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18818381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22342 + ... + 23168.

It is an arithmetic number, because the mean of its divisors is an integer number (991116).

Almost surely, 2^18818385 is an apocalyptic number.

18818385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18818385 is a deficient number, since it is larger than the sum of its proper divisors (12897327).

18818385 is a wasteful number, since it uses less digits than its factorization.

18818385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913.

The product of its digits is 61440, while the sum is 42.

The square root of 18818385 is about 4338.0162516985. The cubic root of 18818385 is about 265.9872277961.

The spelling of 18818385 in words is "eighteen million, eight hundred eighteen thousand, three hundred eighty-five".