6438004 has 6 divisors (see below), whose sum is σ = 11266514. Its totient is φ = 3219000.

The previous prime is 6437983. The next prime is 6438007. The reversal of 6438004 is 4008346.

It can be written as a sum of positive squares in only one way, i.e., 5712100 + 725904 = 2390^2 + 852^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6438004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804747 + ... + 804754.

Almost surely, 2^6438004 is an apocalyptic number.

It is an amenable number.

6438004 is a deficient number, since it is larger than the sum of its proper divisors (4828510).

6438004 is a wasteful number, since it uses less digits than its factorization.

6438004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609505 (or 1609503 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 6438004 is about 2537.3222105204. The cubic root of 6438004 is about 186.0303261147.

The spelling of 6438004 in words is "six million, four hundred thirty-eight thousand, four".