7982813 has 4 divisors (see below), whose sum is σ = 8017308. Its totient is φ = 7948320.

The previous prime is 7982797. The next prime is 7982851. The reversal of 7982813 is 3182897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3182897 = 313 ⋅10169.

It can be written as a sum of positive squares in 2 ways, for example, as 5555449 + 2427364 = 2357^2 + 1558^2 .

It is a cyclic number.

It is not a de Polignac number, because 7982813 - 2⁴ = 7982797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7982893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16898 + ... + 17363.

It is an arithmetic number, because the mean of its divisors is an integer number (2004327).

Almost surely, 2^7982813 is an apocalyptic number.

It is an amenable number.

7982813 is a deficient number, since it is larger than the sum of its proper divisors (34495).

7982813 is a wasteful number, since it uses less digits than its factorization.

7982813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34494.

The product of its digits is 24192, while the sum is 38.

The square root of 7982813 is about 2825.3872300978. The cubic root of 7982813 is about 199.8566723104.

The spelling of 7982813 in words is "seven million, nine hundred eighty-two thousand, eight hundred thirteen".