8006991 has 8 divisors (see below), whose sum is σ = 10732080. Its totient is φ = 5309952.

The previous prime is 8006989. The next prime is 8007001. The reversal of 8006991 is 1996008.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8006991 - 2¹ = 8006989 is a prime.

It is a super-2 number, since 2×8006991² = 128223809748162, which contains 22 as substring.

8006991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8006941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6336 + ... + 7493.

It is an arithmetic number, because the mean of its divisors is an integer number (1341510).

Almost surely, 2^8006991 is an apocalyptic number.

8006991 is a deficient number, since it is larger than the sum of its proper divisors (2725089).

8006991 is a wasteful number, since it uses less digits than its factorization.

8006991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14025.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 8006991 is about 2829.6627007472. The cubic root of 8006991 is about 200.0582413714.

The spelling of 8006991 in words is "eight million, six thousand, nine hundred ninety-one".