1686374845 has 4 divisors (see below), whose sum is σ = 2023649820. Its totient is φ = 1349099872.

The previous prime is 1686374831. The next prime is 1686374867. The reversal of 1686374845 is 5484736861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 781929369 + 904445476 = 27963^2 + 30074^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686374845 - 2¹⁹ = 1685850557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1686374792 and 1686374801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168637480 + ... + 168637489.

It is an arithmetic number, because the mean of its divisors is an integer number (505912455).

Almost surely, 2^1686374845 is an apocalyptic number.

It is an amenable number.

1686374845 is a deficient number, since it is larger than the sum of its proper divisors (337274975).

1686374845 is an equidigital number, since it uses as much as digits as its factorization.

1686374845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337274974.

The product of its digits is 3870720, while the sum is 52.

The square root of 1686374845 is about 41065.4945787823. The cubic root of 1686374845 is about 1190.2861268521.

The spelling of 1686374845 in words is "one billion, six hundred eighty-six million, three hundred seventy-four thousand, eight hundred forty-five".