7981140 has 48 divisors (see below), whose sum is σ = 23526720. Its totient is φ = 2016000.

The previous prime is 7981139. The next prime is 7981147. The reversal of 7981140 is 411897.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 7981098 and 7981107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2361 + ... + 4640.

It is an arithmetic number, because the mean of its divisors is an integer number (490140).

Almost surely, 2^7981140 is an apocalyptic number.

It is an amenable number.

7981140 is an abundant number, since it is smaller than the sum of its proper divisors (15545580).

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

7981140 is a wasteful number, since it uses less digits than its factorization.

7981140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7032 (or 7030 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 7981140 is about 2825.0911489720. The cubic root of 7981140 is about 199.8427096645.

The spelling of 7981140 in words is "seven million, nine hundred eighty-one thousand, one hundred forty".