1685708385 has 16 divisors (see below), whose sum is σ = 2701821696. Its totient is φ = 897481728.

The previous prime is 1685708377. The next prime is 1685708429. The reversal of 1685708385 is 5838075861.

It is not a de Polignac number, because 1685708385 - 2³ = 1685708377 is a prime.

It is a super-2 number, since 2×1685708385² = 5683225518518616450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88729 + ... + 106038.

It is an arithmetic number, because the mean of its divisors is an integer number (168863856).

Almost surely, 2^1685708385 is an apocalyptic number.

1685708385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1685708385 is a deficient number, since it is larger than the sum of its proper divisors (1016113311).

1685708385 is a wasteful number, since it uses less digits than its factorization.

1685708385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195352.

The product of its (nonzero) digits is 1612800, while the sum is 51.

The square root of 1685708385 is about 41057.3791784132. The cubic root of 1685708385 is about 1190.1293047356.

The spelling of 1685708385 in words is "one billion, six hundred eighty-five million, seven hundred eight thousand, three hundred eighty-five".