2745865 has 12 divisors (see below), whose sum is σ = 3417804. Its totient is φ = 2117696.

The previous prime is 2745863. The next prime is 2745907. The reversal of 2745865 is 5685472.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 95481 + 2650384 = 309^2 + 1628^2 .

It is not a de Polignac number, because 2745865 - 2¹ = 2745863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2745863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3879 + ... + 4531.

It is an arithmetic number, because the mean of its divisors is an integer number (284817).

2^2745865 is an apocalyptic number.

It is an amenable number.

2745865 is a deficient number, since it is larger than the sum of its proper divisors (671939).

2745865 is an equidigital number, since it uses as much as digits as its factorization.

2745865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 687 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The square root of 2745865 is about 1657.0651767508. The cubic root of 2745865 is about 140.0317105040.

The spelling of 2745865 in words is "two million, seven hundred forty-five thousand, eight hundred sixty-five".