4120721 has 8 divisors (see below), whose sum is σ = 4540224. Its totient is φ = 3708720.

The previous prime is 4120709. The next prime is 4120723. The reversal of 4120721 is 1270214.

4120721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4120721 - 2¹⁰ = 4119697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4120721.

It is not an unprimeable number, because it can be changed into a prime (4120723) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 686 + ... + 2951.

It is an arithmetic number, because the mean of its divisors is an integer number (567528).

Almost surely, 2^4120721 is an apocalyptic number.

It is an amenable number.

4120721 is a deficient number, since it is larger than the sum of its proper divisors (419503).

4120721 is a wasteful number, since it uses less digits than its factorization.

4120721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3751.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 4120721 is about 2029.9559108513. The cubic root of 4120721 is about 160.3212426091.

Adding to 4120721 its reverse (1270214), we get a palindrome (5390935).

The spelling of 4120721 in words is "four million, one hundred twenty thousand, seven hundred twenty-one".