18130312 has 8 divisors (see below), whose sum is σ = 33994350. Its totient is φ = 9065152.

The previous prime is 18130309. The next prime is 18130349. The reversal of 18130312 is 21303181.

It can be written as a sum of positive squares in only one way, i.e., 13351716 + 4778596 = 3654^2 + 2186^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18130312.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1133137 + ... + 1133152.

Almost surely, 2^18130312 is an apocalyptic number.

It is an amenable number.

18130312 is a deficient number, since it is larger than the sum of its proper divisors (15864038).

18130312 is a wasteful number, since it uses less digits than its factorization.

18130312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266295 (or 2266291 counting only the distinct ones).

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

The square root of 18130312 is about 4257.9704085397. The cubic root of 18130312 is about 262.7050527814.

Adding to 18130312 its reverse (21303181), we get a palindrome (39433493).

The spelling of 18130312 in words is "eighteen million, one hundred thirty thousand, three hundred twelve".