7978845 has 16 divisors (see below), whose sum is σ = 14590080. Its totient is φ = 3647424.

The previous prime is 7978837. The next prime is 7978847. The reversal of 7978845 is 5488797.

It is not a de Polignac number, because 7978845 - 2³ = 7978837 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7978794 and 7978803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37890 + ... + 38099.

It is an arithmetic number, because the mean of its divisors is an integer number (911880).

Almost surely, 2^7978845 is an apocalyptic number.

It is an amenable number.

7978845 is a deficient number, since it is larger than the sum of its proper divisors (6611235).

7978845 is a wasteful number, since it uses less digits than its factorization.

7978845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76004.

The product of its digits is 564480, while the sum is 48.

The square root of 7978845 is about 2824.6849381834. The cubic root of 7978845 is about 199.8235527109.

Subtracting from 7978845 its sum of digits (48), we obtain a palindrome (7978797).

The spelling of 7978845 in words is "seven million, nine hundred seventy-eight thousand, eight hundred forty-five".