6440836 has 12 divisors (see below), whose sum is σ = 11430720. Its totient is φ = 3174920.

The previous prime is 6440831. The next prime is 6440873. The reversal of 6440836 is 6380446.

It is a junction number, because it is equal to n+sod(n) for n = 6440798 and 6440807.

It is not an unprimeable number, because it can be changed into a prime (6440831) 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, 11056 + ... + 11623.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^6440836 is an apocalyptic number.

It is an amenable number.

6440836 is a deficient number, since it is larger than the sum of its proper divisors (4989884).

6440836 is a wasteful number, since it uses less digits than its factorization.

6440836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22754 (or 22752 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 6440836 is about 2537.8802178196. The cubic root of 6440836 is about 186.0575996119.

The spelling of 6440836 in words is "six million, four hundred forty thousand, eight hundred thirty-six".