8421986852440 has 384 divisors, whose sum is σ = 23929911388800. Its totient is φ = 2603833344000.

The previous prime is 8421986852353. The next prime is 8421986852561. The reversal of 8421986852440 is 442586891248.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 462001246 + ... + 462019474.

It is an arithmetic number, because the mean of its divisors is an integer number (62317477575).

Almost surely, 2^{8421986852440} 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 8421986852440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11964955694400).

8421986852440 is an abundant number, since it is smaller than the sum of its proper divisors (15507924536360).

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

8421986852440 is a wasteful number, since it uses less digits than its factorization.

8421986852440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18427 (or 18392 counting only the distinct ones).

The product of its (nonzero) digits is 35389440, while the sum is 61.

The spelling of 8421986852440 in words is "eight trillion, four hundred twenty-one billion, nine hundred eighty-six million, eight hundred fifty-two thousand, four hundred forty".