6398556 has 12 divisors (see below), whose sum is σ = 14929992. Its totient is φ = 2132848.

The previous prime is 6398551. The next prime is 6398563. The reversal of 6398556 is 6558936.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398551) 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, 266595 + ... + 266618.

It is an arithmetic number, because the mean of its divisors is an integer number (1244166).

Almost surely, 2^6398556 is an apocalyptic number.

It is an amenable number.

6398556 is an abundant number, since it is smaller than the sum of its proper divisors (8531436).

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

6398556 is a wasteful number, since it uses less digits than its factorization.

6398556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533220 (or 533218 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 6398556 is about 2529.5367164760. The cubic root of 6398556 is about 185.6495888478.

Adding to 6398556 its product of digits (194400), we get a palindrome (6592956).

The spelling of 6398556 in words is "six million, three hundred ninety-eight thousand, five hundred fifty-six".