2663905 has 4 divisors (see below), whose sum is σ = 3196692. Its totient is φ = 2131120.

The previous prime is 2663897. The next prime is 2663953. The reversal of 2663905 is 5093662.

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 350464 + 2313441 = 592^2 + 1521^2 .

It is not a de Polignac number, because 2663905 - 2³ = 2663897 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2663905 is a lucky 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, 266386 + ... + 266395.

It is an arithmetic number, because the mean of its divisors is an integer number (799173).

2^2663905 is an apocalyptic number.

It is an amenable number.

2663905 is a deficient number, since it is larger than the sum of its proper divisors (532787).

2663905 is an equidigital number, since it uses as much as digits as its factorization.

2663905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532786.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 2663905 is about 1632.1473585433. The cubic root of 2663905 is about 138.6243675172.

The spelling of 2663905 in words is "two million, six hundred sixty-three thousand, nine hundred five".