6430721 has 16 divisors (see below), whose sum is σ = 7646400. Its totient is φ = 5342400.

The previous prime is 6430687. The next prime is 6430747. The reversal of 6430721 is 1270346.

6430721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6430721 - 2¹⁰ = 6429697 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6430751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5531 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (477900).

It is a Proth number, since it is equal to 785 ⋅ 2¹³ + 1 and 785 < 2¹³.

Almost surely, 2^6430721 is an apocalyptic number.

It is an amenable number.

6430721 is a deficient number, since it is larger than the sum of its proper divisors (1215679).

6430721 is a wasteful number, since it uses less digits than its factorization.

6430721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 6430721 is about 2535.8866299581. The cubic root of 6430721 is about 185.9601506337.

The spelling of 6430721 in words is "six million, four hundred thirty thousand, seven hundred twenty-one".