1686120318 has 48 divisors (see below), whose sum is σ = 3798412800. Its totient is φ = 539971920.

The previous prime is 1686120313. The next prime is 1686120341. The reversal of 1686120318 is 8130216861.

1686120318 is a `hidden beast` number, since 1 + 6 + 8 + 612 + 0 + 31 + 8 = 666.

It is a super-2 number, since 2×1686120318² = 5686003453544842248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686120311) 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, 66693 + ... + 88431.

It is an arithmetic number, because the mean of its divisors is an integer number (79133600).

Almost surely, 2^1686120318 is an apocalyptic number.

1686120318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686120318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1899206400).

1686120318 is an abundant number, since it is smaller than the sum of its proper divisors (2112292482).

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

1686120318 is a wasteful number, since it uses less digits than its factorization.

1686120318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21917 (or 21914 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1686120318 is about 41062.3954245244. The cubic root of 1686120318 is about 1190.2262399689.

The spelling of 1686120318 in words is "one billion, six hundred eighty-six million, one hundred twenty thousand, three hundred eighteen".