6405220 has 24 divisors (see below), whose sum is σ = 13886208. Its totient is φ = 2479200.

The previous prime is 6405187. The next prime is 6405221. The reversal of 6405220 is 225046.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6405221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4546 + ... + 5785.

It is an arithmetic number, because the mean of its divisors is an integer number (578592).

Almost surely, 2^6405220 is an apocalyptic number.

It is an amenable number.

6405220 is an abundant number, since it is smaller than the sum of its proper divisors (7480988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6405220 is a wasteful number, since it uses less digits than its factorization.

6405220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10371 (or 10369 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 6405220 is about 2530.8536109384. The cubic root of 6405220 is about 185.7140169058.

The spelling of 6405220 in words is "six million, four hundred five thousand, two hundred twenty".