7873281 has 20 divisors (see below), whose sum is σ = 12667732. Its totient is φ = 4844448.

The previous prime is 7873279. The next prime is 7873289. The reversal of 7873281 is 1823787.

It can be written as a sum of positive squares in 2 ways, for example, as 4665600 + 3207681 = 2160^2 + 1791^2 .

It is not a de Polignac number, because 7873281 - 2¹ = 7873279 is a prime.

It is a super-2 number, since 2×7873281² = 123977107409922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7873289) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2686 + ... + 4791.

Almost surely, 2^7873281 is an apocalyptic number.

It is an amenable number.

7873281 is a deficient number, since it is larger than the sum of its proper divisors (4794451).

7873281 is a wasteful number, since it uses less digits than its factorization.

7873281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7502 (or 7493 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 7873281 is about 2805.9367419812. The cubic root of 7873281 is about 198.9383831523.

The spelling of 7873281 in words is "seven million, eight hundred seventy-three thousand, two hundred eighty-one".