8521380 has 72 divisors (see below), whose sum is σ = 29545152. Its totient is φ = 1947456.

The previous prime is 8521343. The next prime is 8521391. The reversal of 8521380 is 831258.

It is a happy number.

It is a super-2 number, since 2×8521380² = 145227834208800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2122 + ... + 4641.

Almost surely, 2^8521380 is an apocalyptic number.

It is an amenable number.

8521380 is an abundant number, since it is smaller than the sum of its proper divisors (21023772).

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

8521380 is a wasteful number, since it uses less digits than its factorization.

8521380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6785 (or 6780 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 8521380 is about 2919.1402843988. The cubic root of 8521380 is about 204.2537212170.

The spelling of 8521380 in words is "eight million, five hundred twenty-one thousand, three hundred eighty".