4053721 has 6 divisors (see below), whose sum is σ = 4715610. Its totient is φ = 3474576.

The previous prime is 4053719. The next prime is 4053737. The reversal of 4053721 is 1273504.

It can be written as a sum of positive squares in only one way, i.e., 3312400 + 741321 = 1820^2 + 861^2 .

It is not a de Polignac number, because 4053721 - 2¹ = 4053719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4053692 and 4053701.

It is not an unprimeable number, because it can be changed into a prime (4053761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41316 + ... + 41413.

It is an arithmetic number, because the mean of its divisors is an integer number (785935).

Almost surely, 2^4053721 is an apocalyptic number.

It is an amenable number.

4053721 is a deficient number, since it is larger than the sum of its proper divisors (661889).

4053721 is an equidigital number, since it uses as much as digits as its factorization.

4053721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82743 (or 82736 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 4053721 is about 2013.3854573827. The cubic root of 4053721 is about 159.4475871326.

It can be divided in two parts, 4053 and 721, that added together give a palindrome (4774).

The spelling of 4053721 in words is "four million, fifty-three thousand, seven hundred twenty-one".