7981845 has 16 divisors (see below), whose sum is σ = 12816960. Its totient is φ = 4241664.

The previous prime is 7981837. The next prime is 7981847. The reversal of 7981845 is 5481897.

It is not a de Polignac number, because 7981845 - 2³ = 7981837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7981797 and 7981806.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 4266 + ... + 5844.

It is an arithmetic number, because the mean of its divisors is an integer number (801060).

Almost surely, 2^7981845 is an apocalyptic number.

It is an amenable number.

7981845 is a deficient number, since it is larger than the sum of its proper divisors (4835115).

7981845 is a wasteful number, since it uses less digits than its factorization.

7981845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924.

The product of its digits is 80640, while the sum is 42.

The square root of 7981845 is about 2825.2159209519. The cubic root of 7981845 is about 199.8485937430.

The spelling of 7981845 in words is "seven million, nine hundred eighty-one thousand, eight hundred forty-five".