6421722 has 8 divisors (see below), whose sum is σ = 12843456. Its totient is φ = 2140572.

The previous prime is 6421721. The next prime is 6421729. The reversal of 6421722 is 2271246.

It is a sphenic number, since it is the product of 3 distinct primes.

6421722 is an admirable number.

It is a d-powerful number, because it can be written as 6⁴ + 4⁴ + 2³ + 1 + 7⁸ + 2¹⁷ + 2¹⁹ .

It is a junction number, because it is equal to n+sod(n) for n = 6421692 and 6421701.

It is not an unprimeable number, because it can be changed into a prime (6421721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535138 + ... + 535149.

It is an arithmetic number, because the mean of its divisors is an integer number (1605432).

Almost surely, 2^6421722 is an apocalyptic number.

6421722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6421722 is a wasteful number, since it uses less digits than its factorization.

6421722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070292.

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

The square root of 6421722 is about 2534.1116786756. Note that the first 3 decimals coincide. The cubic root of 6421722 is about 185.8733673839.

Adding to 6421722 its reverse (2271246), we get a palindrome (8692968).

The spelling of 6421722 in words is "six million, four hundred twenty-one thousand, seven hundred twenty-two".