18479717 has 4 divisors (see below), whose sum is σ = 18516960. Its totient is φ = 18442476.

The previous prime is 18479707. The next prime is 18479729. The reversal of 18479717 is 71797481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71797481 = 7 ⋅10256783.

It is a cyclic number.

It is not a de Polignac number, because 18479717 - 2⁶ = 18479653 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 (18479707) 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, 17867 + ... + 18872.

It is an arithmetic number, because the mean of its divisors is an integer number (4629240).

Almost surely, 2^18479717 is an apocalyptic number.

It is an amenable number.

18479717 is a deficient number, since it is larger than the sum of its proper divisors (37243).

18479717 is an equidigital number, since it uses as much as digits as its factorization.

18479717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37242.

The product of its digits is 98784, while the sum is 44.

The square root of 18479717 is about 4298.8041360360. The cubic root of 18479717 is about 264.3819320744.

The spelling of 18479717 in words is "eighteen million, four hundred seventy-nine thousand, seven hundred seventeen".