2720155 has 4 divisors (see below), whose sum is σ = 3264192. Its totient is φ = 2176120.

The previous prime is 2720149. The next prime is 2720183. The reversal of 2720155 is 5510272.

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

It is not a de Polignac number, because 2720155 - 2³ = 2720147 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272011 + ... + 272020.

It is an arithmetic number, because the mean of its divisors is an integer number (816048).

2^2720155 is an apocalyptic number.

2720155 is a deficient number, since it is larger than the sum of its proper divisors (544037).

2720155 is an equidigital number, since it uses as much as digits as its factorization.

2720155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544036.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 2720155 is about 1649.2892408550. The cubic root of 2720155 is about 139.5932924257.

The spelling of 2720155 in words is "two million, seven hundred twenty thousand, one hundred fifty-five".