2866391 has 4 divisors (see below), whose sum is σ = 3126984. Its totient is φ = 2605800.

The previous prime is 2866363. The next prime is 2866403. The reversal of 2866391 is 1936682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2866391 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 (2866691) 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, 130280 + ... + 130301.

It is an arithmetic number, because the mean of its divisors is an integer number (781746).

2^2866391 is an apocalyptic number.

2866391 is a deficient number, since it is larger than the sum of its proper divisors (260593).

2866391 is a wasteful number, since it uses less digits than its factorization.

2866391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260592.

The product of its digits is 15552, while the sum is 35.

The square root of 2866391 is about 1693.0419368698. The cubic root of 2866391 is about 142.0512775201.

The spelling of 2866391 in words is "two million, eight hundred sixty-six thousand, three hundred ninety-one".