2806945 has 4 divisors (see below), whose sum is σ = 3368340. Its totient is φ = 2245552.

The previous prime is 2806919. The next prime is 2806961. The reversal of 2806945 is 5496082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5496082 = 2 ⋅2748041.

It can be written as a sum of positive squares in 2 ways, for example, as 589824 + 2217121 = 768^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2806945 - 2⁵ = 2806913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2806945.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280690 + ... + 280699.

It is an arithmetic number, because the mean of its divisors is an integer number (842085).

2^2806945 is an apocalyptic number.

It is an amenable number.

2806945 is a deficient number, since it is larger than the sum of its proper divisors (561395).

2806945 is an equidigital number, since it uses as much as digits as its factorization.

2806945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561394.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2806945 is about 1675.3939835155. The cubic root of 2806945 is about 141.0624105451.

It can be divided in two parts, 280 and 6945, that added together give a square (7225 = 85²).

The spelling of 2806945 in words is "two million, eight hundred six thousand, nine hundred forty-five".