18213130 has 32 divisors (see below), whose sum is σ = 35557200. Its totient is φ = 6716736.

The previous prime is 18213119. The next prime is 18213149. The reversal of 18213130 is 3131281.

It can be written as a sum of positive squares in 8 ways, for example, as 915849 + 17297281 = 957^2 + 4159^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18213098 and 18213107.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21556 + ... + 22384.

Almost surely, 2^18213130 is an apocalyptic number.

18213130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18213130 is a deficient number, since it is larger than the sum of its proper divisors (17344070).

18213130 is an equidigital number, since it uses as much as digits as its factorization.

18213130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18213130 is about 4267.6843838316. The cubic root of 18213130 is about 263.1044513718.

The spelling of 18213130 in words is "eighteen million, two hundred thirteen thousand, one hundred thirty".