6388213 has 6 divisors (see below), whose sum is σ = 6889442. Its totient is φ = 5888400.

The previous prime is 6388211. The next prime is 6388219. The reversal of 6388213 is 3128836.

It can be written as a sum of positive squares in 3 ways, for example, as 2053489 + 4334724 = 1433^2 + 2082^2 .

It is not a de Polignac number, because 6388213 - 2¹ = 6388211 is a prime.

It is a Duffinian number.

6388213 is a lucky number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6388211) 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, 8763 + ... + 9463.

Almost surely, 2^6388213 is an apocalyptic number.

It is an amenable number.

6388213 is a deficient number, since it is larger than the sum of its proper divisors (501229).

6388213 is an frugal number, since it uses more digits than its factorization.

6388213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 714 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 6388213 is about 2527.4914441003. The cubic root of 6388213 is about 185.5495032840.

The spelling of 6388213 in words is "six million, three hundred eighty-eight thousand, two hundred thirteen".