1688670 has 48 divisors (see below), whose sum is σ = 4548960. Its totient is φ = 434112.

The previous prime is 1688669. The next prime is 1688677. The reversal of 1688670 is 768861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2287 + ... + 2933.

It is an arithmetic number, because the mean of its divisors is an integer number (94770).

2^1688670 is an apocalyptic number.

1688670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1688670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2274480).

1688670 is an abundant number, since it is smaller than the sum of its proper divisors (2860290).

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

1688670 is a wasteful number, since it uses less digits than its factorization.

1688670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1688670 is about 1299.4883608559. The cubic root of 1688670 is about 119.0825874926.

The spelling of 1688670 in words is "one million, six hundred eighty-eight thousand, six hundred seventy".