6187986 has 48 divisors (see below), whose sum is σ = 15572544. Its totient is φ = 1739232.

The previous prime is 6187981. The next prime is 6188009. The reversal of 6187986 is 6897816.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6187981) 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, 8076 + ... + 8808.

It is an arithmetic number, because the mean of its divisors is an integer number (324428).

Almost surely, 2^6187986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6187986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7786272).

6187986 is an abundant number, since it is smaller than the sum of its proper divisors (9384558).

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

6187986 is a wasteful number, since it uses less digits than its factorization.

6187986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 812 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 6187986 is about 2487.5662805240. The cubic root of 6187986 is about 183.5903180279.

The spelling of 6187986 in words is "six million, one hundred eighty-seven thousand, nine hundred eighty-six".