6438040 has 32 divisors (see below), whose sum is σ = 16555680. Its totient is φ = 2207232.

The previous prime is 6438031. The next prime is 6438059. The reversal of 6438040 is 408346.

It is a junction number, because it is equal to n+sod(n) for n = 6437996 and 6438014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11217 + ... + 11776.

It is an arithmetic number, because the mean of its divisors is an integer number (517365).

Almost surely, 2^6438040 is an apocalyptic number.

It is an amenable number.

6438040 is an abundant number, since it is smaller than the sum of its proper divisors (10117640).

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

6438040 is a wasteful number, since it uses less digits than its factorization.

6438040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23011 (or 23007 counting only the distinct ones).

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

The square root of 6438040 is about 2537.3293046036. The cubic root of 6438040 is about 186.0306728619.

It can be divided in two parts, 643 and 8040, that multiplied together give a triangular number (5169720 = T₃₂₁₅).

The spelling of 6438040 in words is "six million, four hundred thirty-eight thousand, forty".