7821980 has 24 divisors (see below), whose sum is σ = 16828560. Its totient is φ = 3052160.

The previous prime is 7821971. The next prime is 7821991. The reversal of 7821980 is 891287.

It is a happy number.

It is a super-2 number, since 2×7821980² = 122366742240800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7821980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3950 + ... + 5589.

It is an arithmetic number, because the mean of its divisors is an integer number (701190).

Almost surely, 2^7821980 is an apocalyptic number.

It is an amenable number.

7821980 is an abundant number, since it is smaller than the sum of its proper divisors (9006580).

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

7821980 is a wasteful number, since it uses less digits than its factorization.

7821980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9589 (or 9587 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 7821980 is about 2796.7802916926. The cubic root of 7821980 is about 198.5053580519.

The spelling of 7821980 in words is "seven million, eight hundred twenty-one thousand, nine hundred eighty".