18128412 has 36 divisors (see below), whose sum is σ = 46278960. Its totient is φ = 5982912.

The previous prime is 18128401. The next prime is 18128419. The reversal of 18128412 is 21482181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18128419) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1264 + ... + 6152.

Almost surely, 2^18128412 is an apocalyptic number.

18128412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18128412 is an abundant number, since it is smaller than the sum of its proper divisors (28150548).

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

18128412 is a wasteful number, since it uses less digits than its factorization.

18128412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002 (or 4997 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 18128412 is about 4257.7472917025. The cubic root of 18128412 is about 262.6958755714.

The spelling of 18128412 in words is "eighteen million, one hundred twenty-eight thousand, four hundred twelve".