18508413 has 32 divisors (see below), whose sum is σ = 32394240. Its totient is φ = 9106560.

The previous prime is 18508411. The next prime is 18508417. The reversal of 18508413 is 31480581.

It is not a de Polignac number, because 18508413 - 2¹ = 18508411 is a prime.

It is a super-2 number, since 2×18508413² = 685122703557138, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18508411) 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, 2281 + ... + 6497.

It is an arithmetic number, because the mean of its divisors is an integer number (1012320).

Almost surely, 2^18508413 is an apocalyptic number.

It is an amenable number.

18508413 is a deficient number, since it is larger than the sum of its proper divisors (13885827).

18508413 is a wasteful number, since it uses less digits than its factorization.

18508413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18508413 is about 4302.1405137443. The cubic root of 18508413 is about 264.5187087060.

Adding to 18508413 its reverse (31480581), we get a palindrome (49988994).

The spelling of 18508413 in words is "eighteen million, five hundred eight thousand, four hundred thirteen".