18130212 has 36 divisors (see below), whose sum is σ = 46004140. Its totient is φ = 6020352.

The previous prime is 18130193. The next prime is 18130213. The reversal of 18130212 is 21203181.

It can be written as a sum of positive squares in 2 ways, for example, as 8433216 + 9696996 = 2904^2 + 3114^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (18130213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10464 + ... + 12072.

Almost surely, 2^18130212 is an apocalyptic number.

18130212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18130212 is an abundant number, since it is smaller than the sum of its proper divisors (27873928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18130212 is a wasteful number, since it uses less digits than its factorization.

18130212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932 (or 1927 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18130212 is about 4257.9586658398. The cubic root of 18130212 is about 262.7045697863.

Adding to 18130212 its reverse (21203181), we get a palindrome (39333393).

The spelling of 18130212 in words is "eighteen million, one hundred thirty thousand, two hundred twelve".