6366421 has 4 divisors (see below), whose sum is σ = 6371532. Its totient is φ = 6361312.

The previous prime is 6366419. The next prime is 6366433. The reversal of 6366421 is 1246636.

6366421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 792100 + 5574321 = 890^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 6366421 - 2¹ = 6366419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6366421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6366461) 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, 675 + ... + 3631.

It is an arithmetic number, because the mean of its divisors is an integer number (1592883).

Almost surely, 2^6366421 is an apocalyptic number.

It is an amenable number.

6366421 is a deficient number, since it is larger than the sum of its proper divisors (5111).

6366421 is a wasteful number, since it uses less digits than its factorization.

6366421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110.

The product of its digits is 5184, while the sum is 28.

The square root of 6366421 is about 2523.1767674897. The cubic root of 6366421 is about 185.3382756505.

The spelling of 6366421 in words is "six million, three hundred sixty-six thousand, four hundred twenty-one".