1689366 has 64 divisors (see below), whose sum is σ = 4262400. Its totient is φ = 435456.

The previous prime is 1689353. The next prime is 1689367. The reversal of 1689366 is 6639861.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689367) 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 31 ways as a sum of consecutive naturals, for example, 23106 + ... + 23178.

It is an arithmetic number, because the mean of its divisors is an integer number (66600).

2^1689366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1689366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2131200).

1689366 is an abundant number, since it is smaller than the sum of its proper divisors (2573034).

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

1689366 is a wasteful number, since it uses less digits than its factorization.

1689366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133.

The product of its digits is 46656, while the sum is 39.

The square root of 1689366 is about 1299.7561309723. The cubic root of 1689366 is about 119.0989455529.

The spelling of 1689366 in words is "one million, six hundred eighty-nine thousand, three hundred sixty-six".