1685988 has 48 divisors (see below), whose sum is σ = 4455360. Its totient is φ = 551232.

The previous prime is 1685977. The next prime is 1685989. The reversal of 1685988 is 8895861.

It is a super-2 number, since 2×1685988² = 5685111072288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7120 + ... + 7352.

It is an arithmetic number, because the mean of its divisors is an integer number (92820).

2^1685988 is an apocalyptic number.

1685988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2227680).

1685988 is an abundant number, since it is smaller than the sum of its proper divisors (2769372).

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

1685988 is a wasteful number, since it uses less digits than its factorization.

1685988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 305 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 1685988 is about 1298.4560061858. The cubic root of 1685988 is about 119.0195104888.

The spelling of 1685988 in words is "one million, six hundred eighty-five thousand, nine hundred eighty-eight".