18006421380 has 48 divisors (see below), whose sum is σ = 50500330944. Its totient is φ = 4793869440.

The previous prime is 18006421379. The next prime is 18006421423. The reversal of 18006421380 is 8312460081.

It is a super-2 number, since 2×18006421380² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 208006 + ... + 281565.

It is an arithmetic number, because the mean of its divisors is an integer number (1052090228).

Almost surely, 2^18006421380 is an apocalyptic number.

18006421380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18006421380 is an abundant number, since it is smaller than the sum of its proper divisors (32493909564).

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

18006421380 is a wasteful number, since it uses less digits than its factorization.

18006421380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490196 (or 490194 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 18006421380 in words is "eighteen billion, six million, four hundred twenty-one thousand, three hundred eighty".