6420417 has 4 divisors (see below), whose sum is σ = 8560560. Its totient is φ = 4280276.

The previous prime is 6420413. The next prime is 6420431. The reversal of 6420417 is 7140246.

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 6420417 - 2² = 6420413 is a prime.

It is a D-number.

6420417 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6420413) 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, 1070067 + ... + 1070072.

It is an arithmetic number, because the mean of its divisors is an integer number (2140140).

Almost surely, 2^6420417 is an apocalyptic number.

It is an amenable number.

6420417 is a deficient number, since it is larger than the sum of its proper divisors (2140143).

6420417 is a wasteful number, since it uses less digits than its factorization.

6420417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140142.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 6420417 is about 2533.8541789140. The cubic root of 6420417 is about 185.8607756846.

The spelling of 6420417 in words is "six million, four hundred twenty thousand, four hundred seventeen".