2720839 has 16 divisors (see below), whose sum is σ = 3133440. Its totient is φ = 2340000.

The previous prime is 2720821. The next prime is 2720843. The reversal of 2720839 is 9380272.

It is a cyclic number.

It is not a de Polignac number, because 2720839 - 2⁵ = 2720807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

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 2720839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26889 + ... + 26989.

It is an arithmetic number, because the mean of its divisors is an integer number (195840).

2^2720839 is an apocalyptic number.

2720839 is a deficient number, since it is larger than the sum of its proper divisors (412601).

2720839 is a wasteful number, since it uses less digits than its factorization.

2720839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 2720839 is about 1649.4965898722. The cubic root of 2720839 is about 139.6049919808.

The spelling of 2720839 in words is "two million, seven hundred twenty thousand, eight hundred thirty-nine".