1685387885 has 4 divisors (see below), whose sum is σ = 2022465468. Its totient is φ = 1348310304.

The previous prime is 1685387833. The next prime is 1685387903. The reversal of 1685387885 is 5887835861.

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 377408329 + 1307979556 = 19427^2 + 36166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685387885 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168538784 + ... + 168538793.

It is an arithmetic number, because the mean of its divisors is an integer number (505616367).

Almost surely, 2^1685387885 is an apocalyptic number.

It is an amenable number.

1685387885 is a deficient number, since it is larger than the sum of its proper divisors (337077583).

1685387885 is an equidigital number, since it uses as much as digits as its factorization.

1685387885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337077582.

The product of its digits is 12902400, while the sum is 59.

The square root of 1685387885 is about 41053.4759186113. The cubic root of 1685387885 is about 1190.0538744058.

The spelling of 1685387885 in words is "one billion, six hundred eighty-five million, three hundred eighty-seven thousand, eight hundred eighty-five".