6405216 has 24 divisors (see below), whose sum is σ = 16813944. Its totient is φ = 2135040.

The previous prime is 6405187. The next prime is 6405221. The reversal of 6405216 is 6125046.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33265 + ... + 33456.

It is an arithmetic number, because the mean of its divisors is an integer number (700581).

Almost surely, 2^6405216 is an apocalyptic number.

It is an amenable number.

6405216 is an abundant number, since it is smaller than the sum of its proper divisors (10408728).

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

6405216 is a wasteful number, since it uses less digits than its factorization.

6405216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66734 (or 66726 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 6405216 is about 2530.8528206911. The cubic root of 6405216 is about 185.7139782469.

The spelling of 6405216 in words is "six million, four hundred five thousand, two hundred sixteen".