7981843 has 4 divisors (see below), whose sum is σ = 8401960. Its totient is φ = 7561728.

The previous prime is 7981837. The next prime is 7981847. The reversal of 7981843 is 3481897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3481897 = 181 ⋅19237.

It is a cyclic number.

It is not a de Polignac number, because 7981843 - 2⁵ = 7981811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7981796 and 7981805.

It is not an unprimeable number, because it can be changed into a prime (7981847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210030 + ... + 210067.

It is an arithmetic number, because the mean of its divisors is an integer number (2100490).

Almost surely, 2^7981843 is an apocalyptic number.

7981843 is a deficient number, since it is larger than the sum of its proper divisors (420117).

7981843 is a wasteful number, since it uses less digits than its factorization.

7981843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420116.

The product of its digits is 48384, while the sum is 40.

The square root of 7981843 is about 2825.2155669966. The cubic root of 7981843 is about 199.8485770511.

The spelling of 7981843 in words is "seven million, nine hundred eighty-one thousand, eight hundred forty-three".