18135405 has 24 divisors (see below), whose sum is σ = 33090720. Its totient is φ = 9162720.

The previous prime is 18135401. The next prime is 18135409. The reversal of 18135405 is 50453181.

It is an interprime number because it is at equal distance from previous prime (18135401) and next prime (18135409).

It is not a de Polignac number, because 18135405 - 2² = 18135401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18135401) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9751 + ... + 11460.

It is an arithmetic number, because the mean of its divisors is an integer number (1378780).

Almost surely, 2^18135405 is an apocalyptic number.

18135405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18135405 is a deficient number, since it is larger than the sum of its proper divisors (14955315).

18135405 is a wasteful number, since it uses less digits than its factorization.

18135405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21241 (or 21238 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 18135405 is about 4258.5684214299. The cubic root of 18135405 is about 262.7296493717.

Adding to 18135405 its reverse (50453181), we get a palindrome (68588586).

The spelling of 18135405 in words is "eighteen million, one hundred thirty-five thousand, four hundred five".