18023994312 has 32 divisors (see below), whose sum is σ = 45258501600. Its totient is φ = 5981529344.

The previous prime is 18023994293. The next prime is 18023994319. The reversal of 18023994312 is 21349932081.

It is not an unprimeable number, because it can be changed into a prime (18023994319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1648737 + ... + 1659632.

It is an arithmetic number, because the mean of its divisors is an integer number (1414328175).

Almost surely, 2^18023994312 is an apocalyptic number.

18023994312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18023994312 is an abundant number, since it is smaller than the sum of its proper divisors (27234507288).

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

18023994312 is a wasteful number, since it uses less digits than its factorization.

18023994312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308605 (or 3308601 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 18023994312 in words is "eighteen billion, twenty-three million, nine hundred ninety-four thousand, three hundred twelve".