18393479720 has 256 divisors, whose sum is σ = 54568857600. Its totient is φ = 5405736960.

The previous prime is 18393479717. The next prime is 18393479729. The reversal of 18393479720 is 2797439381.

It is not an unprimeable number, because it can be changed into a prime (18393479729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15039029 + ... + 15040251.

It is an arithmetic number, because the mean of its divisors is an integer number (213159600).

Almost surely, 2^18393479720 is an apocalyptic number.

18393479720 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 18393479720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27284428800).

18393479720 is an abundant number, since it is smaller than the sum of its proper divisors (36175377880).

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

18393479720 is a wasteful number, since it uses less digits than its factorization.

18393479720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 18393479720 in words is "eighteen billion, three hundred ninety-three million, four hundred seventy-nine thousand, seven hundred twenty".