7982881 has 4 divisors (see below), whose sum is σ = 7989012. Its totient is φ = 7976752.

The previous prime is 7982879. The next prime is 7982893. The reversal of 7982881 is 1882897.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1882897 = 1163 ⋅1619.

It can be written as a sum of positive squares in 2 ways, for example, as 2692881 + 5290000 = 1641^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 7982881 - 2¹ = 7982879 is a prime.

It is a super-2 number, since 2×7982881² = 127452778120322, which contains 22 as substring.

It is a Duffinian number.

7982881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7982851) 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 3 ways as a sum of consecutive naturals, for example, 250 + ... + 4003.

It is an arithmetic number, because the mean of its divisors is an integer number (1997253).

Almost surely, 2^7982881 is an apocalyptic number.

It is an amenable number.

7982881 is a deficient number, since it is larger than the sum of its proper divisors (6131).

7982881 is a wasteful number, since it uses less digits than its factorization.

7982881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6130.

The product of its digits is 64512, while the sum is 43.

The square root of 7982881 is about 2825.3992638210. The cubic root of 7982881 is about 199.8572397885.

The spelling of 7982881 in words is "seven million, nine hundred eighty-two thousand, eight hundred eighty-one".