18012444000 has 96 divisors (see below), whose sum is σ = 59008805856. Its totient is φ = 4803315200.

The previous prime is 18012443989. The next prime is 18012444001. The reversal of 18012444000 is 44421081.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012444001) 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 15 ways as a sum of consecutive naturals, for example, 738519 + ... + 762518.

It is an arithmetic number, because the mean of its divisors is an integer number (614675061).

Almost surely, 2^18012444000 is an apocalyptic number.

18012444000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18012444000 is an abundant number, since it is smaller than the sum of its proper divisors (40996361856).

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

18012444000 is a wasteful number, since it uses less digits than its factorization.

18012444000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501065 (or 1501047 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 18012444000 its reverse (44421081), we get a palindrome (18056865081).

The spelling of 18012444000 in words is "eighteen billion, twelve million, four hundred forty-four thousand".