18438539040 has 144 divisors (see below), whose sum is σ = 63374875200. Its totient is φ = 4881517056.

The previous prime is 18438539029. The next prime is 18438539057. The reversal of 18438539040 is 4093583481.

18438539040 is a `hidden beast` number, since 1 + 84 + 38 + 539 + 0 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 23 ways as a sum of consecutive naturals, for example, 154101 + ... + 246219.

It is an arithmetic number, because the mean of its divisors is an integer number (440103300).

Almost surely, 2^18438539040 is an apocalyptic number.

18438539040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18438539040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31687437600).

18438539040 is an abundant number, since it is smaller than the sum of its proper divisors (44936336160).

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

18438539040 is a wasteful number, since it uses less digits than its factorization.

18438539040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92279 (or 92268 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 18438539040 in words is "eighteen billion, four hundred thirty-eight million, five hundred thirty-nine thousand, forty".