8421712540 has 48 divisors (see below), whose sum is σ = 18227341440. Its totient is φ = 3266625600.

The previous prime is 8421712529. The next prime is 8421712547. The reversal of 8421712540 is 452171248.

It is a junction number, because it is equal to n+sod(n) for n = 8421712496 and 8421712505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421712547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84315 + ... + 154765.

It is an arithmetic number, because the mean of its divisors is an integer number (379736280).

Almost surely, 2^8421712540 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 8421712540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9113670720).

8421712540 is an abundant number, since it is smaller than the sum of its proper divisors (9805628900).

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

8421712540 is a wasteful number, since it uses less digits than its factorization.

8421712540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70642 (or 70640 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 8421712540 is about 91769.8890704353. The cubic root of 8421712540 is about 2034.5426786582.

Adding to 8421712540 its reverse (452171248), we get a palindrome (8873883788).

The spelling of 8421712540 in words is "eight billion, four hundred twenty-one million, seven hundred twelve thousand, five hundred forty".