6404838 has 32 divisors (see below), whose sum is σ = 14245632. Its totient is φ = 1903200.

The previous prime is 6404837. The next prime is 6404873. The reversal of 6404838 is 8384046.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 6404799 and 6404808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2583 + ... + 4413.

It is an arithmetic number, because the mean of its divisors is an integer number (445176).

Almost surely, 2^6404838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6404838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7122816).

6404838 is an abundant number, since it is smaller than the sum of its proper divisors (7840794).

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

6404838 is a wasteful number, since it uses less digits than its factorization.

6404838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 6404838 is about 2530.7781412048. The cubic root of 6404838 is about 185.7103249085.

The spelling of 6404838 in words is "six million, four hundred four thousand, eight hundred thirty-eight".