2649905 has 4 divisors (see below), whose sum is σ = 3179892. Its totient is φ = 2119920.

The previous prime is 2649893. The next prime is 2649923. The reversal of 2649905 is 5099462.

2649905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5099462 = 2 ⋅2549731.

It can be written as a sum of positive squares in 2 ways, for example, as 1915456 + 734449 = 1384^2 + 857^2 .

It is not a de Polignac number, because 2649905 - 2¹² = 2645809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264986 + ... + 264995.

It is an arithmetic number, because the mean of its divisors is an integer number (794973).

2^2649905 is an apocalyptic number.

It is an amenable number.

2649905 is a deficient number, since it is larger than the sum of its proper divisors (529987).

2649905 is an equidigital number, since it uses as much as digits as its factorization.

2649905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529986.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 2649905 is about 1627.8528803304. The cubic root of 2649905 is about 138.3810967143.

The spelling of 2649905 in words is "two million, six hundred forty-nine thousand, nine hundred five".