18843225840 has 120 divisors (see below), whose sum is σ = 63418472208. Its totient is φ = 5014010880.

The previous prime is 18843225829. The next prime is 18843225883. The reversal of 18843225840 is 4852234881.

18843225840 is a `hidden beast` number, since 1 + 8 + 8 + 43 + 22 + 584 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308220 + ... + 364260.

Almost surely, 2^18843225840 is an apocalyptic number.

18843225840 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 18843225840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31709236104).

18843225840 is an abundant number, since it is smaller than the sum of its proper divisors (44575246368).

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

18843225840 is a wasteful number, since it uses less digits than its factorization.

18843225840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56527 (or 56518 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 45.

The spelling of 18843225840 in words is "eighteen billion, eight hundred forty-three million, two hundred twenty-five thousand, eight hundred forty".