7944813 has 12 divisors (see below), whose sum is σ = 11536668. Its totient is φ = 5268480.

The previous prime is 7944799. The next prime is 7944841. The reversal of 7944813 is 3184497.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7193124 + 751689 = 2682^2 + 867^2 .

It is not a de Polignac number, because 7944813 - 2⁹ = 7944301 is a prime.

7944813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7944113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 468 + ... + 4013.

It is an arithmetic number, because the mean of its divisors is an integer number (961389).

Almost surely, 2^7944813 is an apocalyptic number.

It is an amenable number.

7944813 is a deficient number, since it is larger than the sum of its proper divisors (3591855).

7944813 is a wasteful number, since it uses less digits than its factorization.

7944813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684 (or 4681 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 7944813 is about 2818.6544662303. The cubic root of 7944813 is about 199.5390467601.

The spelling of 7944813 in words is "seven million, nine hundred forty-four thousand, eight hundred thirteen".