1689716 has 36 divisors (see below), whose sum is σ = 3547908. Its totient is φ = 701568.

The previous prime is 1689713. The next prime is 1689719. The reversal of 1689716 is 6179861.

It is an interprime number because it is at equal distance from previous prime (1689713) and next prime (1689719).

It can be written as a sum of positive squares in 2 ways, for example, as 960400 + 729316 = 980^2 + 854^2 .

Its product of digits (18144) is a multiple of the sum of its prime factors (288).

It is a self number, because there is not a number n which added to its sum of digits gives 1689716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7136 + ... + 7368.

It is an arithmetic number, because the mean of its divisors is an integer number (98553).

2^1689716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1689716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1773954).

1689716 is an abundant number, since it is smaller than the sum of its proper divisors (1858192).

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

1689716 is a wasteful number, since it uses less digits than its factorization.

1689716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 279 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 1689716 is about 1299.8907646414. The cubic root of 1689716 is about 119.1071698912.

The spelling of 1689716 in words is "one million, six hundred eighty-nine thousand, seven hundred sixteen".