2789991 has 8 divisors (see below), whose sum is σ = 4133360. Its totient is φ = 1859976.

The previous prime is 2789951. The next prime is 2789993. The reversal of 2789991 is 1999872.

2789991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-2789991 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 (2789993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51640 + ... + 51693.

It is an arithmetic number, because the mean of its divisors is an integer number (516670).

2^2789991 is an apocalyptic number.

2789991 is a deficient number, since it is larger than the sum of its proper divisors (1343369).

2789991 is a wasteful number, since it uses less digits than its factorization.

2789991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103342 (or 103336 counting only the distinct ones).

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

The square root of 2789991 is about 1670.3266147673. The cubic root of 2789991 is about 140.7778302894. Note that the first 3 decimals are identical.

The spelling of 2789991 in words is "two million, seven hundred eighty-nine thousand, nine hundred ninety-one".