2840789 has 4 divisors (see below), whose sum is σ = 3246624. Its totient is φ = 2434956.

The previous prime is 2840779. The next prime is 2840801. The reversal of 2840789 is 9870482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9870482 = 2 ⋅4935241.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2840789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840759) 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, 202907 + ... + 202920.

It is an arithmetic number, because the mean of its divisors is an integer number (811656).

2^2840789 is an apocalyptic number.

It is an amenable number.

2840789 is a deficient number, since it is larger than the sum of its proper divisors (405835).

2840789 is an equidigital number, since it uses as much as digits as its factorization.

2840789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405834.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 2840789 is about 1685.4640310609. The cubic root of 2840789 is about 141.6270880593.

The spelling of 2840789 in words is "two million, eight hundred forty thousand, seven hundred eighty-nine".