2663945 has 4 divisors (see below), whose sum is σ = 3196740. Its totient is φ = 2131152.

The previous prime is 2663897. The next prime is 2663953. The reversal of 2663945 is 5493662.

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 712336 + 1951609 = 844^2 + 1397^2 .

It is a cyclic number.

It is not a de Polignac number, because 2663945 - 2¹⁰ = 2662921 is a prime.

It is a Curzon number.

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, 266390 + ... + 266399.

It is an arithmetic number, because the mean of its divisors is an integer number (799185).

2^2663945 is an apocalyptic number.

It is an amenable number.

2663945 is a deficient number, since it is larger than the sum of its proper divisors (532795).

2663945 is an equidigital number, since it uses as much as digits as its factorization.

2663945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532794.

The product of its digits is 38880, while the sum is 35.

The square root of 2663945 is about 1632.1596122929. The cubic root of 2663945 is about 138.6250613541.

The spelling of 2663945 in words is "two million, six hundred sixty-three thousand, nine hundred forty-five".