8004991 has 8 divisors (see below), whose sum is σ = 8190720. Its totient is φ = 7821528.

The previous prime is 8004979. The next prime is 8005003. The reversal of 8004991 is 1994008.

It is an interprime number because it is at equal distance from previous prime (8004979) and next prime (8005003).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8004991 is a prime.

8004991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8004901) 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, 7980 + ... + 8926.

It is an arithmetic number, because the mean of its divisors is an integer number (1023840).

Almost surely, 2^8004991 is an apocalyptic number.

8004991 is a deficient number, since it is larger than the sum of its proper divisors (185729).

8004991 is a wasteful number, since it uses less digits than its factorization.

8004991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 8004991 is about 2829.3092796653. The cubic root of 8004991 is about 200.0415830203.

Adding to 8004991 its reverse (1994008), we get a palindrome (9998999).

The spelling of 8004991 in words is "eight million, four thousand, nine hundred ninety-one".