8040991 has 4 divisors (see below), whose sum is σ = 9189712. Its totient is φ = 6892272.

The previous prime is 8040947. The next prime is 8041003. The reversal of 8040991 is 1990408.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8040991 - 2⁷ = 8040863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8040931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 574350 + ... + 574363.

It is an arithmetic number, because the mean of its divisors is an integer number (2297428).

Almost surely, 2^8040991 is an apocalyptic number.

8040991 is a deficient number, since it is larger than the sum of its proper divisors (1148721).

8040991 is a wasteful number, since it uses less digits than its factorization.

8040991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148720.

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

The square root of 8040991 is about 2835.6641197434. The cubic root of 8040991 is about 200.3410098975.

The spelling of 8040991 in words is "eight million, forty thousand, nine hundred ninety-one".