2750905 has 4 divisors (see below), whose sum is σ = 3301092. Its totient is φ = 2200720.

The previous prime is 2750903. The next prime is 2750933. The reversal of 2750905 is 5090572.

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 779689 + 1971216 = 883^2 + 1404^2 .

It is not a de Polignac number, because 2750905 - 2¹ = 2750903 is a prime.

It is an Ulam number.

It is a Duffinian number.

2750905 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2750903) 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, 275086 + ... + 275095.

It is an arithmetic number, because the mean of its divisors is an integer number (825273).

2^2750905 is an apocalyptic number.

It is an amenable number.

2750905 is a deficient number, since it is larger than the sum of its proper divisors (550187).

2750905 is an equidigital number, since it uses as much as digits as its factorization.

2750905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550186.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 2750905 is about 1658.5852404987. The cubic root of 2750905 is about 140.1173336083.

It can be divided in two parts, 2750 and 905, that added together give a triangular number (3655 = T₈₅).

The spelling of 2750905 in words is "two million, seven hundred fifty thousand, nine hundred five".