18438184380 has 192 divisors, whose sum is σ = 64519741440. Its totient is φ = 3822163200.

The previous prime is 18438184361. The next prime is 18438184399. The reversal of 18438184380 is 8348183481.

It is an interprime number because it is at equal distance from previous prime (18438184361) and next prime (18438184399).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2023635 + ... + 2032725.

It is an arithmetic number, because the mean of its divisors is an integer number (336040320).

Almost surely, 2^18438184380 is an apocalyptic number.

18438184380 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 18438184380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32259870720).

18438184380 is an abundant number, since it is smaller than the sum of its proper divisors (46081557060).

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

18438184380 is a wasteful number, since it uses less digits than its factorization.

18438184380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560 (or 9558 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 48.

The spelling of 18438184380 in words is "eighteen billion, four hundred thirty-eight million, one hundred eighty-four thousand, three hundred eighty".