1685671873 has 8 divisors (see below), whose sum is σ = 1822804992. Its totient is φ = 1552758336.

The previous prime is 1685671861. The next prime is 1685671877. The reversal of 1685671873 is 3781765861.

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

It is a cyclic number.

It is not a de Polignac number, because 1685671873 - 2²¹ = 1683574721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1685671873.

It is not an unprimeable number, because it can be changed into a prime (1685671877) 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, 1054065 + ... + 1055662.

It is an arithmetic number, because the mean of its divisors is an integer number (227850624).

Almost surely, 2^1685671873 is an apocalyptic number.

It is an amenable number.

1685671873 is a deficient number, since it is larger than the sum of its proper divisors (137133119).

1685671873 is a wasteful number, since it uses less digits than its factorization.

1685671873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109791.

The product of its digits is 1693440, while the sum is 52.

The square root of 1685671873 is about 41056.9345299914. The cubic root of 1685671873 is about 1190.1207120444.

The spelling of 1685671873 in words is "one billion, six hundred eighty-five million, six hundred seventy-one thousand, eight hundred seventy-three".