6390817 has 4 divisors (see below), whose sum is σ = 6611220. Its totient is φ = 6170416.

The previous prime is 6390799. The next prime is 6390829. The reversal of 6390817 is 7180936.

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 4343056 + 2047761 = 2084^2 + 1431^2 .

It is a cyclic number.

It is not a de Polignac number, because 6390817 - 2⁷ = 6390689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6390847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110158 + ... + 110215.

It is an arithmetic number, because the mean of its divisors is an integer number (1652805).

Almost surely, 2^6390817 is an apocalyptic number.

It is an amenable number.

6390817 is a deficient number, since it is larger than the sum of its proper divisors (220403).

6390817 is a wasteful number, since it uses less digits than its factorization.

6390817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220402.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 6390817 is about 2528.0065268903. The cubic root of 6390817 is about 185.5747114432.

The spelling of 6390817 in words is "six million, three hundred ninety thousand, eight hundred seventeen".