6439404 has 48 divisors (see below), whose sum is σ = 16110080. Its totient is φ = 1995840.

The previous prime is 6439397. The next prime is 6439427. The reversal of 6439404 is 4049346.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁷ + 4⁸ + 3⁵ + 9⁷ + 4⁹ + 0 + 4¹⁰ .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13677 + ... + 14139.

Almost surely, 2^6439404 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 6439404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8055040).

6439404 is an abundant number, since it is smaller than the sum of its proper divisors (9670676).

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

6439404 is a wasteful number, since it uses less digits than its factorization.

6439404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6439404 is about 2537.5980769223. The cubic root of 6439404 is about 186.0438097752.

The spelling of 6439404 in words is "six million, four hundred thirty-nine thousand, four hundred four".