18135413 has 4 divisors (see below), whose sum is σ = 19202220. Its totient is φ = 17068608.

The previous prime is 18135409. The next prime is 18135427. The reversal of 18135413 is 31453181.

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 8162449 + 9972964 = 2857^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 18135413 - 2² = 18135409 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 (18135113) 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 3 ways as a sum of consecutive naturals, for example, 533378 + ... + 533411.

It is an arithmetic number, because the mean of its divisors is an integer number (4800555).

Almost surely, 2^18135413 is an apocalyptic number.

It is an amenable number.

18135413 is a deficient number, since it is larger than the sum of its proper divisors (1066807).

18135413 is a wasteful number, since it uses less digits than its factorization.

18135413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066806.

The product of its digits is 1440, while the sum is 26.

The square root of 18135413 is about 4258.5693607126. The cubic root of 18135413 is about 262.7296880040.

Adding to 18135413 its reverse (31453181), we get a palindrome (49588594).

The spelling of 18135413 in words is "eighteen million, one hundred thirty-five thousand, four hundred thirteen".