2839681 has 4 divisors (see below), whose sum is σ = 3058132. Its totient is φ = 2621232.

The previous prime is 2839657. The next prime is 2839691. The reversal of 2839681 is 1869382.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1299600 + 1540081 = 1140^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 2839681 - 2⁷ = 2839553 is a prime.

It is a super-2 number, since 2×2839681² = 16127576363522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2839681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2839601) 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, 109206 + ... + 109231.

It is an arithmetic number, because the mean of its divisors is an integer number (764533).

2^2839681 is an apocalyptic number.

It is an amenable number.

2839681 is a deficient number, since it is larger than the sum of its proper divisors (218451).

2839681 is a wasteful number, since it uses less digits than its factorization.

2839681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218450.

The product of its digits is 20736, while the sum is 37.

The square root of 2839681 is about 1685.1353061401. The cubic root of 2839681 is about 141.6086726098.

Subtracting from 2839681 its reverse (1869382), we obtain a cube (970299 = 99³).

The spelling of 2839681 in words is "two million, eight hundred thirty-nine thousand, six hundred eighty-one".