6561838 has 8 divisors (see below), whose sum is σ = 9864432. Its totient is φ = 3273696.

The previous prime is 6561833. The next prime is 6561857. The reversal of 6561838 is 8381656.

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

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 6561797 and 6561806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561833) 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, 2395 + ... + 4342.

It is an arithmetic number, because the mean of its divisors is an integer number (1233054).

Almost surely, 2^6561838 is an apocalyptic number.

6561838 is a deficient number, since it is larger than the sum of its proper divisors (3302594).

6561838 is a wasteful number, since it uses less digits than its factorization.

6561838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7226.

The product of its digits is 34560, while the sum is 37.

The square root of 6561838 is about 2561.6084790615. The cubic root of 6561838 is about 187.2155140611.

It can be divided in two parts, 65618 and 38, that added together give a palindrome (65656).

The spelling of 6561838 in words is "six million, five hundred sixty-one thousand, eight hundred thirty-eight".