6375721 has 4 divisors (see below), whose sum is σ = 6955344. Its totient is φ = 5796100.

The previous prime is 6375701. The next prime is 6375751. The reversal of 6375721 is 1275736.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6375721 - 2¹¹ = 6373673 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 6⁴ + 3¹² + 7² + 5⁷ + 7⁸ + 2³ + 1 .

It is not an unprimeable number, because it can be changed into a prime (6375701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289795 + ... + 289816.

It is an arithmetic number, because the mean of its divisors is an integer number (1738836).

Almost surely, 2^6375721 is an apocalyptic number.

It is an amenable number.

6375721 is a deficient number, since it is larger than the sum of its proper divisors (579623).

6375721 is a wasteful number, since it uses less digits than its factorization.

6375721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579622.

The product of its digits is 8820, while the sum is 31.

The square root of 6375721 is about 2525.0190098294. The cubic root of 6375721 is about 185.4284784687.

The spelling of 6375721 in words is "six million, three hundred seventy-five thousand, seven hundred twenty-one".