18304212 has 12 divisors (see below), whose sum is σ = 42709856. Its totient is φ = 6101400.

The previous prime is 18304211. The next prime is 18304213. The reversal of 18304212 is 21240381.

It is an interprime number because it is at equal distance from previous prime (18304211) and next prime (18304213).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-4 number, since 4×18304212⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18304211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762664 + ... + 762687.

Almost surely, 2^18304212 is an apocalyptic number.

18304212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18304212 is an abundant number, since it is smaller than the sum of its proper divisors (24405644).

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

18304212 is a wasteful number, since it uses less digits than its factorization.

18304212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525358 (or 1525356 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18304212 is about 4278.3422023022. The cubic root of 18304212 is about 263.5423084370.

Adding to 18304212 its reverse (21240381), we get a palindrome (39544593).

The spelling of 18304212 in words is "eighteen million, three hundred four thousand, two hundred twelve".