2643839 has 4 divisors (see below), whose sum is σ = 2884200. Its totient is φ = 2403480.

The previous prime is 2643833. The next prime is 2643853. The reversal of 2643839 is 9383462.

It is a happy number.

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 2643839 - 2⁸ = 2643583 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 6³ + 4¹⁰ + 3 + 8³ + 3¹³ + 9² .

It is a junction number, because it is equal to n+sod(n) for n = 2643799 and 2643808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643833) 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, 120164 + ... + 120185.

It is an arithmetic number, because the mean of its divisors is an integer number (721050).

2^2643839 is an apocalyptic number.

2643839 is a deficient number, since it is larger than the sum of its proper divisors (240361).

2643839 is a wasteful number, since it uses less digits than its factorization.

2643839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240360.

The product of its digits is 31104, while the sum is 35.

The square root of 2643839 is about 1625.9886223464. The cubic root of 2643839 is about 138.2754248677.

The spelling of 2643839 in words is "two million, six hundred forty-three thousand, eight hundred thirty-nine".