2720831 has 4 divisors (see below), whose sum is σ = 2839152. Its totient is φ = 2602512.

The previous prime is 2720821. The next prime is 2720843. The reversal of 2720831 is 1380272.

2720831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2720831 - 2¹⁴ = 2704447 is a prime.

It is a super-2 number, since 2×2720831² = 14805842661122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 118297 = 2720831 / (2 + 7 + 2 + 0 + 8 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2720797 and 2720806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59126 + ... + 59171.

It is an arithmetic number, because the mean of its divisors is an integer number (709788).

2^2720831 is an apocalyptic number.

2720831 is a deficient number, since it is larger than the sum of its proper divisors (118321).

2720831 is a wasteful number, since it uses less digits than its factorization.

2720831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118320.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2720831 is about 1649.4941648881. The cubic root of 2720831 is about 139.6048551553.

The spelling of 2720831 in words is "two million, seven hundred twenty thousand, eight hundred thirty-one".