2742665 has 4 divisors (see below), whose sum is σ = 3291204. Its totient is φ = 2194128.

The previous prime is 2742653. The next prime is 2742667. The reversal of 2742665 is 5662472.

2742665 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 can be written as a sum of positive squares in 2 ways, for example, as 395641 + 2347024 = 629^2 + 1532^2 .

It is a cyclic number.

It is not a de Polignac number, because 2742665 - 2⁸ = 2742409 is a prime.

It is a super-2 number, since 2×2742665² = 15044422604450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2742667) 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, 274262 + ... + 274271.

It is an arithmetic number, because the mean of its divisors is an integer number (822801).

2^2742665 is an apocalyptic number.

It is an amenable number.

2742665 is a deficient number, since it is larger than the sum of its proper divisors (548539).

2742665 is an equidigital number, since it uses as much as digits as its factorization.

2742665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548538.

The product of its digits is 20160, while the sum is 32.

The square root of 2742665 is about 1656.0993327696. The cubic root of 2742665 is about 139.9772922354.

The spelling of 2742665 in words is "two million, seven hundred forty-two thousand, six hundred sixty-five".