388520372240 has 640 divisors, whose sum is σ = 1260213341184. Its totient is φ = 107495424000.

The previous prime is 388520372209. The next prime is 388520372243. The reversal of 388520372240 is 42273025883.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 388520372191 and 388520372200.

It is not an unprimeable number, because it can be changed into a prime (388520372243) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 239678630 + ... + 239680250.

Almost surely, 2^388520372240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388520372240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (630106670592).

388520372240 is an abundant number, since it is smaller than the sum of its proper divisors (871692968944).

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

388520372240 is a wasteful number, since it uses less digits than its factorization.

388520372240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779 (or 1773 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 388520372240 in words is "three hundred eighty-eight billion, five hundred twenty million, three hundred seventy-two thousand, two hundred forty".