18840647380 has 96 divisors (see below), whose sum is σ = 42442848000. Its totient is φ = 7004371968.

The previous prime is 18840647351. The next prime is 18840647381. The reversal of 18840647380 is 8374604881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18840647381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5518554 + ... + 5521966.

It is an arithmetic number, because the mean of its divisors is an integer number (442113000).

Almost surely, 2^18840647380 is an apocalyptic number.

18840647380 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 18840647380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21221424000).

18840647380 is an abundant number, since it is smaller than the sum of its proper divisors (23602200620).

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

18840647380 is a wasteful number, since it uses less digits than its factorization.

18840647380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713 (or 3711 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 18840647380 in words is "eighteen billion, eight hundred forty million, six hundred forty-seven thousand, three hundred eighty".