6438906 has 64 divisors (see below), whose sum is σ = 15206400. Its totient is φ = 2017008.

The previous prime is 6438893. The next prime is 6438911. The reversal of 6438906 is 6098346.

6438906 is a `hidden beast` number, since 643 + 8 + 9 + 0 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109105 + ... + 109163.

It is an arithmetic number, because the mean of its divisors is an integer number (237600).

Almost surely, 2^6438906 is an apocalyptic number.

It is a pronic number, being equal to 2537×2538.

It is a practical number, because each smaller number is the sum of distinct divisors of 6438906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7603200).

6438906 is an abundant number, since it is smaller than the sum of its proper divisors (8767494).

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

6438906 is a wasteful number, since it uses less digits than its factorization.

6438906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6438906 is about 2537.4999507389. The cubic root of 6438906 is about 186.0390136685.

The spelling of 6438906 in words is "six million, four hundred thirty-eight thousand, nine hundred six".