2720005 has 4 divisors (see below), whose sum is σ = 3264012. Its totient is φ = 2176000.

The previous prime is 2719991. The next prime is 2720009. The reversal of 2720005 is 5000272.

It is a happy number.

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 1117249 + 1602756 = 1057^2 + 1266^2 .

It is not a de Polignac number, because 2720005 - 2¹⁹ = 2195717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271996 + ... + 272005.

It is an arithmetic number, because the mean of its divisors is an integer number (816003).

2^2720005 is an apocalyptic number.

It is an amenable number.

2720005 is a deficient number, since it is larger than the sum of its proper divisors (544007).

2720005 is an equidigital number, since it uses as much as digits as its factorization.

2720005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544006.

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 2720005 is about 1649.2437660940. The cubic root of 2720005 is about 139.5907264716.

Adding to 2720005 its reverse (5000272), we get a palindrome (7720277).

The spelling of 2720005 in words is "two million, seven hundred twenty thousand, five".