18238644930 has 128 divisors (see below), whose sum is σ = 48534183936. Its totient is φ = 4349542400.

The previous prime is 18238644929. The next prime is 18238644971. The reversal of 18238644930 is 3944683281.

It is a super-2 number, since 2×18238644930² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18238644930.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7037935 + ... + 7040525.

It is an arithmetic number, because the mean of its divisors is an integer number (379173312).

Almost surely, 2^18238644930 is an apocalyptic number.

18238644930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18238644930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24267091968).

18238644930 is an abundant number, since it is smaller than the sum of its proper divisors (30295539006).

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

18238644930 is a wasteful number, since it uses less digits than its factorization.

18238644930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952.

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 18238644930 in words is "eighteen billion, two hundred thirty-eight million, six hundred forty-four thousand, nine hundred thirty".