18242138240 has 64 divisors (see below), whose sum is σ = 44261112960. Its totient is φ = 7187930112.

The previous prime is 18242138237. The next prime is 18242138351. The reversal of 18242138240 is 4283124281.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 18242138240.

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, 169832 + ... + 255591.

It is an arithmetic number, because the mean of its divisors is an integer number (691579890).

Almost surely, 2^18242138240 is an apocalyptic number.

18242138240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18242138240 is an abundant number, since it is smaller than the sum of its proper divisors (26018974720).

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

18242138240 is an equidigital number, since it uses as much as digits as its factorization.

18242138240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425509 (or 425497 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The spelling of 18242138240 in words is "eighteen billion, two hundred forty-two million, one hundred thirty-eight thousand, two hundred forty".