18814217 has 8 divisors (see below), whose sum is σ = 19275816. Its totient is φ = 18358272.

The previous prime is 18814193. The next prime is 18814247. The reversal of 18814217 is 71241881.

It can be written as a sum of positive squares in 4 ways, for example, as 3984016 + 14830201 = 1996^2 + 3851^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18814217 - 2⁸ = 18813961 is a prime.

It is a super-2 number, since 2×18814217² = 707949522646178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18814247) 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, 5753 + ... + 8409.

It is an arithmetic number, because the mean of its divisors is an integer number (2409477).

Almost surely, 2^18814217 is an apocalyptic number.

It is an amenable number.

18814217 is a deficient number, since it is larger than the sum of its proper divisors (461599).

18814217 is an equidigital number, since it uses as much as digits as its factorization.

18814217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2827.

The product of its digits is 3584, while the sum is 32.

The square root of 18814217 is about 4337.5358211777. The cubic root of 18814217 is about 265.9675889053.

The spelling of 18814217 in words is "eighteen million, eight hundred fourteen thousand, two hundred seventeen".