7991980 has 24 divisors (see below), whose sum is σ = 17175312. Its totient is φ = 3122112.

The previous prime is 7991957. The next prime is 7991981. The reversal of 7991980 is 891997.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (7991981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3787 + ... + 5506.

It is an arithmetic number, because the mean of its divisors is an integer number (715638).

Almost surely, 2^7991980 is an apocalyptic number.

It is an amenable number.

7991980 is an abundant number, since it is smaller than the sum of its proper divisors (9183332).

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

7991980 is a wasteful number, since it uses less digits than its factorization.

7991980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9345 (or 9343 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 7991980 is about 2827.0090201483. The cubic root of 7991980 is about 199.9331443207.

The spelling of 7991980 in words is "seven million, nine hundred ninety-one thousand, nine hundred eighty".