18240422412 has 24 divisors (see below), whose sum is σ = 44411463936. Its totient is φ = 5815786768.

The previous prime is 18240422383. The next prime is 18240422423. The reversal of 18240422412 is 21422404281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18240422412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33043968 + ... + 33044519.

It is an arithmetic number, because the mean of its divisors is an integer number (1850477664).

Almost surely, 2^18240422412 is an apocalyptic number.

18240422412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18240422412 is an abundant number, since it is smaller than the sum of its proper divisors (26171041524).

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

18240422412 is a wasteful number, since it uses less digits than its factorization.

18240422412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66088517 (or 66088515 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

Adding to 18240422412 its reverse (21422404281), we get a palindrome (39662826693).

The spelling of 18240422412 in words is "eighteen billion, two hundred forty million, four hundred twenty-two thousand, four hundred twelve".