9425784420 has 144 divisors (see below), whose sum is σ = 30821983920. Its totient is φ = 2317851648.

The previous prime is 9425784409. The next prime is 9425784451. The reversal of 9425784420 is 244875249.

It can be written as a sum of positive squares in 8 ways, for example, as 3068273664 + 6357510756 = 55392^2 + 79734^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3997882 + ... + 4000238.

It is an arithmetic number, because the mean of its divisors is an integer number (214041555).

Almost surely, 2^9425784420 is an apocalyptic number.

9425784420 is a gapful number since it is divisible by the number (90) 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 9425784420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15410991960).

9425784420 is an abundant number, since it is smaller than the sum of its proper divisors (21396199500).

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

9425784420 is a wasteful number, since it uses less digits than its factorization.

9425784420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094 (or 4089 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 9425784420 is about 97086.4790792209. The cubic root of 9425784420 is about 2112.3822079671.

The spelling of 9425784420 in words is "nine billion, four hundred twenty-five million, seven hundred eighty-four thousand, four hundred twenty".