2789643 has 4 divisors (see below), whose sum is σ = 3719528. Its totient is φ = 1859760.

The previous prime is 2789629. The next prime is 2789669. The reversal of 2789643 is 3469872.

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

It is not a de Polignac number, because 2789643 - 2⁴ = 2789627 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 7³ + 8 + 9⁵ + 6⁸ + 4¹⁰ + 3 .

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2782643) 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, 464938 + ... + 464943.

It is an arithmetic number, because the mean of its divisors is an integer number (929882).

2^2789643 is an apocalyptic number.

2789643 is a deficient number, since it is larger than the sum of its proper divisors (929885).

2789643 is an equidigital number, since it uses as much as digits as its factorization.

2789643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929884.

The product of its digits is 72576, while the sum is 39.

The square root of 2789643 is about 1670.2224402755. Note that the first 3 decimals coincide. The cubic root of 2789643 is about 140.7719768987.

The spelling of 2789643 in words is "two million, seven hundred eighty-nine thousand, six hundred forty-three".