2806991 has 4 divisors (see below), whose sum is σ = 3062184. Its totient is φ = 2551800.

The previous prime is 2806987. The next prime is 2807009. The reversal of 2806991 is 1996082.

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 2806991 - 2² = 2806987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2806961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127580 + ... + 127601.

It is an arithmetic number, because the mean of its divisors is an integer number (765546).

2^2806991 is an apocalyptic number.

2806991 is a deficient number, since it is larger than the sum of its proper divisors (255193).

2806991 is a wasteful number, since it uses less digits than its factorization.

2806991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255192.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 2806991 is about 1675.4077115735. The cubic root of 2806991 is about 141.0631811142.

The spelling of 2806991 in words is "two million, eight hundred six thousand, nine hundred ninety-one".