7890813 has 36 divisors (see below), whose sum is σ = 13738140. Its totient is φ = 4346496.

The previous prime is 7890811. The next prime is 7890847. The reversal of 7890813 is 3180987.

It can be written as a sum of positive squares in 2 ways, for example, as 1750329 + 6140484 = 1323^2 + 2478^2 .

It is not a de Polignac number, because 7890813 - 2¹ = 7890811 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7890811) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12481 + ... + 13097.

It is an arithmetic number, because the mean of its divisors is an integer number (381615).

Almost surely, 2^7890813 is an apocalyptic number.

It is an amenable number.

7890813 is a deficient number, since it is larger than the sum of its proper divisors (5847327).

7890813 is a wasteful number, since it uses less digits than its factorization.

7890813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 7890813 is about 2809.0590951420. The cubic root of 7890813 is about 199.0859371430.

The spelling of 7890813 in words is "seven million, eight hundred ninety thousand, eight hundred thirteen".