18272817 has 8 divisors (see below), whose sum is σ = 27070880. Its totient is φ = 12181860.

The previous prime is 18272809. The next prime is 18272867. The reversal of 18272817 is 71827281.

It is a happy number.

It is not a de Polignac number, because 18272817 - 2³ = 18272809 is a prime.

It is a super-2 number, since 2×18272817² = 667791682230978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18272867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338359 + ... + 338412.

It is an arithmetic number, because the mean of its divisors is an integer number (3383860).

Almost surely, 2^18272817 is an apocalyptic number.

It is an amenable number.

18272817 is a deficient number, since it is larger than the sum of its proper divisors (8798063).

18272817 is an equidigital number, since it uses as much as digits as its factorization.

18272817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676780 (or 676774 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 18272817 is about 4274.6715663311. The cubic root of 18272817 is about 263.3915481330.

The spelling of 18272817 in words is "eighteen million, two hundred seventy-two thousand, eight hundred seventeen".