2749409 has 4 divisors (see below), whose sum is σ = 2960916. Its totient is φ = 2537904.

The previous prime is 2749391. The next prime is 2749441. The reversal of 2749409 is 9049472.

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 1149184 + 1600225 = 1072^2 + 1265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2749409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2749499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105734 + ... + 105759.

It is an arithmetic number, because the mean of its divisors is an integer number (740229).

2^2749409 is an apocalyptic number.

It is an amenable number.

2749409 is a deficient number, since it is larger than the sum of its proper divisors (211507).

2749409 is a wasteful number, since it uses less digits than its factorization.

2749409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211506.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 2749409 is about 1658.1341923982. The cubic root of 2749409 is about 140.0919294183.

The spelling of 2749409 in words is "two million, seven hundred forty-nine thousand, four hundred nine".