6426821 has 6 divisors (see below), whose sum is σ = 6718950. Its totient is φ = 6146888.

The previous prime is 6426809. The next prime is 6426851. The reversal of 6426821 is 1286246.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 25921 = 2530^2 + 161^2 .

It is not a de Polignac number, because 6426821 - 2⁶ = 6426757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6426851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5546 + ... + 6603.

It is an arithmetic number, because the mean of its divisors is an integer number (1119825).

Almost surely, 2^6426821 is an apocalyptic number.

It is an amenable number.

6426821 is a deficient number, since it is larger than the sum of its proper divisors (292129).

6426821 is a wasteful number, since it uses less digits than its factorization.

6426821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12195 (or 12172 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 6426821 is about 2535.1175515151. The cubic root of 6426821 is about 185.9225503269.

The spelling of 6426821 in words is "six million, four hundred twenty-six thousand, eight hundred twenty-one".