8279991 has 24 divisors (see below), whose sum is σ = 12907440. Its totient is φ = 5097600.

The previous prime is 8279987. The next prime is 8280011. The reversal of 8279991 is 1999728.

It is not a de Polignac number, because 8279991 - 2² = 8279987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8279291) 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 23 ways as a sum of consecutive naturals, for example, 6421 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (537810).

Almost surely, 2^8279991 is an apocalyptic number.

8279991 is a deficient number, since it is larger than the sum of its proper divisors (4627449).

8279991 is a wasteful number, since it uses less digits than its factorization.

8279991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 1244 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 8279991 is about 2877.4973501291. The cubic root of 8279991 is about 202.3065550904.

The spelling of 8279991 in words is "eight million, two hundred seventy-nine thousand, nine hundred ninety-one".