1689885 has 36 divisors (see below), whose sum is σ = 3168828. Its totient is φ = 830208.

The previous prime is 1689881. The next prime is 1689893. The reversal of 1689885 is 5889861.

It can be written as a sum of positive squares in 2 ways, for example, as 974169 + 715716 = 987^2 + 846^2 .

It is not a de Polignac number, because 1689885 - 2² = 1689881 is a prime.

It is a super-2 number, since 2×1689885² = 5711422626450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (138240) is a multiple of the sum of its prime divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 1689885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689881) 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 35 ways as a sum of consecutive naturals, for example, 35932 + ... + 35978.

It is an arithmetic number, because the mean of its divisors is an integer number (88023).

2^1689885 is an apocalyptic number.

1689885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1689885 is a deficient number, since it is larger than the sum of its proper divisors (1478943).

1689885 is a wasteful number, since it uses less digits than its factorization.

1689885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 72 counting only the distinct ones).

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

The square root of 1689885 is about 1299.9557684783. The cubic root of 1689885 is about 119.1111406651. Note that the first 4 decimals are identical.

The spelling of 1689885 in words is "one million, six hundred eighty-nine thousand, eight hundred eighty-five".