2800945 has 16 divisors (see below), whose sum is σ = 3893760. Its totient is φ = 1894464.

The previous prime is 2800927. The next prime is 2800949. The reversal of 2800945 is 5490082.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2800945 - 2¹⁵ = 2768177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2800949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2259 + ... + 3271.

It is an arithmetic number, because the mean of its divisors is an integer number (243360).

2^2800945 is an apocalyptic number.

It is an amenable number.

2800945 is a deficient number, since it is larger than the sum of its proper divisors (1092815).

2800945 is a wasteful number, since it uses less digits than its factorization.

2800945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2800945 is about 1673.6024020059. The cubic root of 2800945 is about 140.9618292799.

The spelling of 2800945 in words is "two million, eight hundred thousand, nine hundred forty-five".