6438861 has 24 divisors (see below), whose sum is σ = 10928736. Its totient is φ = 3601440.

The previous prime is 6438833. The next prime is 6438871. The reversal of 6438861 is 1688346.

It is a happy number.

6438861 is a `hidden beast` number, since 643 + 8 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 6438861 - 2⁵ = 6438829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1215 + ... + 3788.

It is an arithmetic number, because the mean of its divisors is an integer number (455364).

Almost surely, 2^6438861 is an apocalyptic number.

It is an amenable number.

6438861 is a deficient number, since it is larger than the sum of its proper divisors (4489875).

6438861 is a wasteful number, since it uses less digits than its factorization.

6438861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5033 (or 5030 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 6438861 is about 2537.4910837282. The cubic root of 6438861 is about 186.0385802732.

The spelling of 6438861 in words is "six million, four hundred thirty-eight thousand, eight hundred sixty-one".