18840961840 has 80 divisors (see below), whose sum is σ = 44390721312. Its totient is φ = 7436132352.

The previous prime is 18840961817. The next prime is 18840961873. The reversal of 18840961840 is 4816904881.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2689222 + ... + 2696218.

Almost surely, 2^18840961840 is an apocalyptic number.

18840961840 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 18840961840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22195360656).

18840961840 is an abundant number, since it is smaller than the sum of its proper divisors (25549759472).

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

18840961840 is a wasteful number, since it uses less digits than its factorization.

18840961840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7454 (or 7448 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 49.

The spelling of 18840961840 in words is "eighteen billion, eight hundred forty million, nine hundred sixty-one thousand, eight hundred forty".