18806385444 has 96 divisors (see below), whose sum is σ = 54737120256. Its totient is φ = 4882308480.

The previous prime is 18806385401. The next prime is 18806385469. The reversal of 18806385444 is 44458360881.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2469747 + ... + 2477349.

It is an arithmetic number, because the mean of its divisors is an integer number (570178336).

Almost surely, 2^18806385444 is an apocalyptic number.

18806385444 is a gapful number since it is divisible by the number (14) 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 18806385444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27368560128).

18806385444 is an abundant number, since it is smaller than the sum of its proper divisors (35930734812).

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

18806385444 is a wasteful number, since it uses less digits than its factorization.

18806385444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10305 (or 10303 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 51.

The spelling of 18806385444 in words is "eighteen billion, eight hundred six million, three hundred eighty-five thousand, four hundred forty-four".