18812817440 has 96 divisors (see below), whose sum is σ = 47762555904. Its totient is φ = 6976696320.

The previous prime is 18812817421. The next prime is 18812817479. The reversal of 18812817440 is 4471821881.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18812817391 and 18812817400.

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, 130625 + ... + 233855.

It is an arithmetic number, because the mean of its divisors is an integer number (497526624).

Almost surely, 2^18812817440 is an apocalyptic number.

18812817440 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 18812817440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23881277952).

18812817440 is an abundant number, since it is smaller than the sum of its proper divisors (28949738464).

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

18812817440 is a wasteful number, since it uses less digits than its factorization.

18812817440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103330 (or 103322 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 44.

The spelling of 18812817440 in words is "eighteen billion, eight hundred twelve million, eight hundred seventeen thousand, four hundred forty".