6400836 has 96 divisors (see below), whose sum is σ = 18439680. Its totient is φ = 1907712.

The previous prime is 6400813. The next prime is 6400837. The reversal of 6400836 is 6380046.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6400837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65940 + ... + 66036.

It is an arithmetic number, because the mean of its divisors is an integer number (192080).

Almost surely, 2^6400836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6400836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9219840).

6400836 is an abundant number, since it is smaller than the sum of its proper divisors (12038844).

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

6400836 is a wasteful number, since it uses less digits than its factorization.

6400836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6400836 is about 2529.9873517470. The cubic root of 6400836 is about 185.6716370931.

The spelling of 6400836 in words is "six million, four hundred thousand, eight hundred thirty-six".