18828917 has 4 divisors (see below), whose sum is σ = 19478220. Its totient is φ = 18179616.

The previous prime is 18828907. The next prime is 18828923. The reversal of 18828917 is 71982881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71982881 = 179 ⋅402139.

It can be written as a sum of positive squares in 2 ways, for example, as 3352561 + 15476356 = 1831^2 + 3934^2 .

It is a cyclic number.

It is not a de Polignac number, because 18828917 - 2¹⁴ = 18812533 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 (18828907) 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, 324608 + ... + 324665.

It is an arithmetic number, because the mean of its divisors is an integer number (4869555).

Almost surely, 2^18828917 is an apocalyptic number.

It is an amenable number.

18828917 is a deficient number, since it is larger than the sum of its proper divisors (649303).

18828917 is an equidigital number, since it uses as much as digits as its factorization.

18828917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649302.

The product of its digits is 64512, while the sum is 44.

The square root of 18828917 is about 4339.2300008181. The cubic root of 18828917 is about 266.0368398295.

The spelling of 18828917 in words is "eighteen million, eight hundred twenty-eight thousand, nine hundred seventeen".