6639486 has 48 divisors (see below), whose sum is σ = 16150656. Its totient is φ = 1782144.

The previous prime is 6639481. The next prime is 6639497. The reversal of 6639486 is 6849366.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an Ulam number.

Its product of digits (186624) is a multiple of the sum of its prime divisors (576).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639481) 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, 11865 + ... + 12411.

It is an arithmetic number, because the mean of its divisors is an integer number (336472).

Almost surely, 2^6639486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8075328).

6639486 is an abundant number, since it is smaller than the sum of its proper divisors (9511170).

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

6639486 is a wasteful number, since it uses less digits than its factorization.

6639486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 576 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 6639486 is about 2576.7200080723. The cubic root of 6639486 is about 187.9510775071.

The spelling of 6639486 in words is "six million, six hundred thirty-nine thousand, four hundred eighty-six".