18618413 has 4 divisors (see below), whose sum is σ = 20311008. Its totient is φ = 16925820.

The previous prime is 18618409. The next prime is 18618443. The reversal of 18618413 is 31481681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18618413 - 2² = 18618409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18618413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18618443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 846281 + ... + 846302.

It is an arithmetic number, because the mean of its divisors is an integer number (5077752).

Almost surely, 2^18618413 is an apocalyptic number.

It is an amenable number.

18618413 is a deficient number, since it is larger than the sum of its proper divisors (1692595).

18618413 is a wasteful number, since it uses less digits than its factorization.

18618413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692594.

The product of its digits is 4608, while the sum is 32.

The square root of 18618413 is about 4314.9059085918. The cubic root of 18618413 is about 265.0417069754.

The spelling of 18618413 in words is "eighteen million, six hundred eighteen thousand, four hundred thirteen".