1686144887 has 8 divisors (see below), whose sum is σ = 1927875072. Its totient is φ = 1444627800.

The previous prime is 1686144869. The next prime is 1686144907. The reversal of 1686144887 is 7884416861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1686144887 - 2¹⁰ = 1686143863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686144857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35939 + ... + 68292.

It is an arithmetic number, because the mean of its divisors is an integer number (240984384).

Almost surely, 2^1686144887 is an apocalyptic number.

1686144887 is a deficient number, since it is larger than the sum of its proper divisors (241730185).

1686144887 is a wasteful number, since it uses less digits than its factorization.

1686144887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106549.

The product of its digits is 2064384, while the sum is 53.

The square root of 1686144887 is about 41062.6945901021. The cubic root of 1686144887 is about 1190.2320209969.

The spelling of 1686144887 in words is "one billion, six hundred eighty-six million, one hundred forty-four thousand, eight hundred eighty-seven".