18217130 has 8 divisors (see below), whose sum is σ = 32790852. Its totient is φ = 7286848.

The previous prime is 18217123. The next prime is 18217141. The reversal of 18217130 is 3171281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18156121 + 61009 = 4261^2 + 247^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18217096 and 18217105.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 910847 + ... + 910866.

Almost surely, 2^18217130 is an apocalyptic number.

18217130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18217130 is a deficient number, since it is larger than the sum of its proper divisors (14573722).

18217130 is a wasteful number, since it uses less digits than its factorization.

18217130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821720.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 18217130 is about 4268.1529963205. The cubic root of 18217130 is about 263.1237111177.

The spelling of 18217130 in words is "eighteen million, two hundred seventeen thousand, one hundred thirty".