18725217 has 8 divisors (see below), whose sum is σ = 28533696. Its totient is φ = 10700112.

The previous prime is 18725207. The next prime is 18725237. The reversal of 18725217 is 71252781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18725217 - 2⁶ = 18725153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18725207) 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 7 ways as a sum of consecutive naturals, for example, 445818 + ... + 445859.

It is an arithmetic number, because the mean of its divisors is an integer number (3566712).

Almost surely, 2^18725217 is an apocalyptic number.

It is an amenable number.

18725217 is a deficient number, since it is larger than the sum of its proper divisors (9808479).

18725217 is an equidigital number, since it uses as much as digits as its factorization.

18725217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891687.

The product of its digits is 7840, while the sum is 33.

The square root of 18725217 is about 4327.2643783342. The cubic root of 18725217 is about 265.5475423886.

Adding to 18725217 its reverse (71252781), we get a palindrome (89977998).

The spelling of 18725217 in words is "eighteen million, seven hundred twenty-five thousand, two hundred seventeen".