7891980 has 48 divisors (see below), whose sum is σ = 22815744. Its totient is φ = 2036160.

The previous prime is 7891979. The next prime is 7891981. The reversal of 7891980 is 891987.

It is an interprime number because it is at equal distance from previous prime (7891979) and next prime (7891981).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7891981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262 + ... + 3981.

It is an arithmetic number, because the mean of its divisors is an integer number (475328).

Almost surely, 2^7891980 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 7891980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11407872).

7891980 is an abundant number, since it is smaller than the sum of its proper divisors (14923764).

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

7891980 is a wasteful number, since it uses less digits than its factorization.

7891980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286 (or 4284 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 7891980 is about 2809.2668082615. The cubic root of 7891980 is about 199.0957511650.

The spelling of 7891980 in words is "seven million, eight hundred ninety-one thousand, nine hundred eighty".