18184364440 has 32 divisors (see below), whose sum is σ = 44634350160. Its totient is φ = 6612496000.

The previous prime is 18184364423. The next prime is 18184364441. The reversal of 18184364440 is 4446348181.

It is a happy number.

It is a super-2 number, since 2×18184364440² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18184364441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20663611 + ... + 20664490.

Almost surely, 2^18184364440 is an apocalyptic number.

18184364440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18184364440 is an abundant number, since it is smaller than the sum of its proper divisors (26449985720).

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

18184364440 is a wasteful number, since it uses less digits than its factorization.

18184364440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41328123 (or 41328119 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 43.

The spelling of 18184364440 in words is "eighteen billion, one hundred eighty-four million, three hundred sixty-four thousand, four hundred forty".