4049821 has 8 divisors (see below), whose sum is σ = 4249080. Its totient is φ = 3854592.

The previous prime is 4049813. The next prime is 4049827. The reversal of 4049821 is 1289404.

It can be written as a sum of positive squares in 4 ways, for example, as 1473796 + 2576025 = 1214^2 + 1605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4049821 - 2³ = 4049813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4049821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4049827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161 + ... + 3073.

It is an arithmetic number, because the mean of its divisors is an integer number (531135).

Almost surely, 2^4049821 is an apocalyptic number.

It is an amenable number.

4049821 is a deficient number, since it is larger than the sum of its proper divisors (199259).

4049821 is a wasteful number, since it uses less digits than its factorization.

4049821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 4049821 is about 2012.4167063508. The cubic root of 4049821 is about 159.3964369985.

The spelling of 4049821 in words is "four million, forty-nine thousand, eight hundred twenty-one".