1685685900 has 72 divisors (see below), whose sum is σ = 5045458320. Its totient is φ = 434013440.

The previous prime is 1685685797. The next prime is 1685685907. The reversal of 1685685900 is 95865861.

It is a super-3 number, since 3×1685685900³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1685685900.

It is not an unprimeable number, because it can be changed into a prime (1685685907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88179 + ... + 105578.

It is an arithmetic number, because the mean of its divisors is an integer number (70075810).

Almost surely, 2^1685685900 is an apocalyptic number.

1685685900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685685900 is an abundant number, since it is smaller than the sum of its proper divisors (3359772420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1685685900 is a wasteful number, since it uses less digits than its factorization.

1685685900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193803 (or 193796 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 1685685900 is about 41057.1053533977. The cubic root of 1685685900 is about 1190.1240131568.

The spelling of 1685685900 in words is "one billion, six hundred eighty-five million, six hundred eighty-five thousand, nine hundred".