6638489 has 12 divisors (see below), whose sum is σ = 7844112. Its totient is φ = 5569200.

The previous prime is 6638473. The next prime is 6638491. The reversal of 6638489 is 9848366.

It is not a de Polignac number, because 6638489 - 2⁴ = 6638473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6638459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74 + ... + 3644.

It is an arithmetic number, because the mean of its divisors is an integer number (653676).

Almost surely, 2^6638489 is an apocalyptic number.

It is an amenable number.

6638489 is a deficient number, since it is larger than the sum of its proper divisors (1205623).

6638489 is a wasteful number, since it uses less digits than its factorization.

6638489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608 (or 3595 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 6638489 is about 2576.5265378024. The cubic root of 6638489 is about 187.9416693188.

The spelling of 6638489 in words is "six million, six hundred thirty-eight thousand, four hundred eighty-nine".