6421320 has 48 divisors (see below), whose sum is σ = 20870460. Its totient is φ = 1712256.

The previous prime is 6421279. The next prime is 6421339. The reversal of 6421320 is 231246.

6421320 = T₃₆₀ + T₃₆₁ + ... + T₄₃₉.

It is a happy number.

6421320 is a `hidden beast` number, since 642 + 1 + 3 + 20 = 666.

6421320 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6320196 + 101124 = 2514^2 + 318^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 6421293 and 6421302.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8559 + ... + 9278.

Almost surely, 2^6421320 is an apocalyptic number.

6421320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6421320 is an abundant number, since it is smaller than the sum of its proper divisors (14449140).

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

6421320 is a wasteful number, since it uses less digits than its factorization.

6421320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17854 (or 17847 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 6421320 is about 2534.0323596987. The cubic root of 6421320 is about 185.8694887434.

Adding to 6421320 its reverse (231246), we get a palindrome (6652566).

The spelling of 6421320 in words is "six million, four hundred twenty-one thousand, three hundred twenty".