6421965 has 16 divisors (see below), whose sum is σ = 11209536. Its totient is φ = 3113600.

The previous prime is 6421931. The next prime is 6421967. The reversal of 6421965 is 5691246.

It is not a de Polignac number, because 6421965 - 2⁶ = 6421901 is a prime.

It is a super-2 number, since 2×6421965² = 82483268922450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19296 + ... + 19625.

It is an arithmetic number, because the mean of its divisors is an integer number (700596).

Almost surely, 2^6421965 is an apocalyptic number.

It is an amenable number.

6421965 is a deficient number, since it is larger than the sum of its proper divisors (4787571).

6421965 is a wasteful number, since it uses less digits than its factorization.

6421965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38940.

The product of its digits is 12960, while the sum is 33.

The square root of 6421965 is about 2534.1596240174. The cubic root of 6421965 is about 185.8757118568.

The spelling of 6421965 in words is "six million, four hundred twenty-one thousand, nine hundred sixty-five".