2839840 has 24 divisors (see below), whose sum is σ = 6709500. Its totient is φ = 1135872.

The previous prime is 2839831. The next prime is 2839841. The reversal of 2839840 is 489382.

It can be written as a sum of positive squares in 2 ways, for example, as 2521744 + 318096 = 1588^2 + 564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2839796 and 2839805.

It is not an unprimeable number, because it can be changed into a prime (2839841) 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, 8715 + ... + 9034.

2^2839840 is an apocalyptic number.

2839840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2839840 is an abundant number, since it is smaller than the sum of its proper divisors (3869660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2839840 is a wasteful number, since it uses less digits than its factorization.

2839840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17764 (or 17756 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 2839840 is about 1685.1824827003. The cubic root of 2839840 is about 141.6113155544.

The spelling of 2839840 in words is "two million, eight hundred thirty-nine thousand, eight hundred forty".