2709649 has 4 divisors (see below), whose sum is σ = 2775780. Its totient is φ = 2643520.

The previous prime is 2709643. The next prime is 2709659. The reversal of 2709649 is 9469072.

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 322624 + 2387025 = 568^2 + 1545^2 .

It is a cyclic number.

It is not a de Polignac number, because 2709649 - 2²¹ = 612497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2709643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33004 + ... + 33085.

It is an arithmetic number, because the mean of its divisors is an integer number (693945).

2^2709649 is an apocalyptic number.

It is an amenable number.

2709649 is a deficient number, since it is larger than the sum of its proper divisors (66131).

2709649 is an equidigital number, since it uses as much as digits as its factorization.

2709649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66130.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 2709649 is about 1646.1011512055. The cubic root of 2709649 is about 139.4133444338.

The spelling of 2709649 in words is "two million, seven hundred nine thousand, six hundred forty-nine".