4049905 has 4 divisors (see below), whose sum is σ = 4859892. Its totient is φ = 3239920.

The previous prime is 4049897. The next prime is 4049921. The reversal of 4049905 is 5099404.

It is a happy number.

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 2211169 + 1838736 = 1487^2 + 1356^2 .

It is not a de Polignac number, because 4049905 - 2³ = 4049897 is a prime.

It is an Ulam number.

It is a Duffinian 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, 404986 + ... + 404995.

It is an arithmetic number, because the mean of its divisors is an integer number (1214973).

Almost surely, 2^4049905 is an apocalyptic number.

It is an amenable number.

4049905 is a deficient number, since it is larger than the sum of its proper divisors (809987).

4049905 is an equidigital number, since it uses as much as digits as its factorization.

4049905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809986.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 4049905 is about 2012.4375766716. The cubic root of 4049905 is about 159.3975390397.

The spelling of 4049905 in words is "four million, forty-nine thousand, nine hundred five".