2745649 has 3 divisors (see below), whose sum is σ = 2747307. Its totient is φ = 2743992.

The previous prime is 2745643. The next prime is 2745661. The reversal of 2745649 is 9465472.

The square root of 2745649 is 1657.

It is a perfect power (a square), and thus also a powerful number.

2745649 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 1871424 = 935^2 + 1368^2 .

It is not a de Polignac number, because 2745649 - 2⁷ = 2745521 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 7⁵ + 4 + 5³ + 6⁸ + 4¹⁰ + 9 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2745643) 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 2 ways as a sum of consecutive naturals, for example, 829 + ... + 2485.

It is an arithmetic number, because the mean of its divisors is an integer number (915769).

2^2745649 is an apocalyptic number.

2745649 is the 1657-th square number.

2745649 is the 829-th centered octagonal number.

It is an amenable number.

2745649 is a deficient number, since it is larger than the sum of its proper divisors (1658).

2745649 is an frugal number, since it uses more digits than its factorization.

2745649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314 (or 1657 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The cubic root of 2745649 is about 140.0280386019.

The spelling of 2745649 in words is "two million, seven hundred forty-five thousand, six hundred forty-nine".