2745621 has 6 divisors (see below), whose sum is σ = 3965910. Its totient is φ = 1830408.

The previous prime is 2745607. The next prime is 2745637. The reversal of 2745621 is 1265472.

2745621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2604996 + 140625 = 1614^2 + 375^2 .

It is not a de Polignac number, because 2745621 - 2¹⁹ = 2221333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2745661) 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 5 ways as a sum of consecutive naturals, for example, 152526 + ... + 152543.

It is an arithmetic number, because the mean of its divisors is an integer number (660985).

2^2745621 is an apocalyptic number.

It is an amenable number.

2745621 is a deficient number, since it is larger than the sum of its proper divisors (1220289).

2745621 is a wasteful number, since it uses less digits than its factorization.

2745621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305075 (or 305072 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2745621 is about 1656.9915509742. The cubic root of 2745621 is about 140.0275626004.

The spelling of 2745621 in words is "two million, seven hundred forty-five thousand, six hundred twenty-one".