1686987180 has 144 divisors (see below), whose sum is σ = 5544643104. Its totient is φ = 413521920.

The previous prime is 1686987173. The next prime is 1686987199. The reversal of 1686987180 is 817896861.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125170 + ... + 137990.

It is an arithmetic number, because the mean of its divisors is an integer number (38504466).

Almost surely, 2^1686987180 is an apocalyptic number.

1686987180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686987180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2772321552).

1686987180 is an abundant number, since it is smaller than the sum of its proper divisors (3857655924).

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

1686987180 is a wasteful number, since it uses less digits than its factorization.

1686987180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12896 (or 12891 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 1686987180 is about 41072.9494923362. The cubic root of 1686987180 is about 1190.4301766083.

The spelling of 1686987180 in words is "one billion, six hundred eighty-six million, nine hundred eighty-seven thousand, one hundred eighty".