6380921 has 4 divisors (see below), whose sum is σ = 6388644. Its totient is φ = 6373200.

The previous prime is 6380897. The next prime is 6380923. The reversal of 6380921 is 1290836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3367225 + 3013696 = 1835^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 6380921 - 2¹⁰ = 6379897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6380923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450 + ... + 4331.

It is an arithmetic number, because the mean of its divisors is an integer number (1597161).

Almost surely, 2^6380921 is an apocalyptic number.

It is an amenable number.

6380921 is a deficient number, since it is larger than the sum of its proper divisors (7723).

6380921 is an equidigital number, since it uses as much as digits as its factorization.

6380921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7722.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 6380921 is about 2526.0484951798. The cubic root of 6380921 is about 185.4788762233.

The spelling of 6380921 in words is "six million, three hundred eighty thousand, nine hundred twenty-one".