7991273 has 4 divisors (see below), whose sum is σ = 8249088. Its totient is φ = 7733460.

The previous prime is 7991257. The next prime is 7991303. The reversal of 7991273 is 3721997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3721997 = 17 ⋅218941.

It is a cyclic number.

It is not a de Polignac number, because 7991273 - 2⁴ = 7991257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7991233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128861 + ... + 128922.

It is an arithmetic number, because the mean of its divisors is an integer number (2062272).

Almost surely, 2^7991273 is an apocalyptic number.

It is an amenable number.

7991273 is a deficient number, since it is larger than the sum of its proper divisors (257815).

7991273 is a wasteful number, since it uses less digits than its factorization.

7991273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257814.

The product of its digits is 23814, while the sum is 38.

The square root of 7991273 is about 2826.8839735652. The cubic root of 7991273 is about 199.9272485393.

The spelling of 7991273 in words is "seven million, nine hundred ninety-one thousand, two hundred seventy-three".