1689449 has 4 divisors (see below), whose sum is σ = 1706964. Its totient is φ = 1671936.

The previous prime is 1689437. The next prime is 1689451. The reversal of 1689449 is 9449861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9449861 = 503 ⋅18787.

It can be written as a sum of positive squares in 2 ways, for example, as 1243225 + 446224 = 1115^2 + 668^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689449 - 2²⁰ = 640873 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1689049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8612 + ... + 8805.

It is an arithmetic number, because the mean of its divisors is an integer number (426741).

2^1689449 is an apocalyptic number.

It is an amenable number.

1689449 is a deficient number, since it is larger than the sum of its proper divisors (17515).

1689449 is an equidigital number, since it uses as much as digits as its factorization.

1689449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17514.

The product of its digits is 62208, while the sum is 41.

The square root of 1689449 is about 1299.7880596466. The cubic root of 1689449 is about 119.1008959987.

The spelling of 1689449 in words is "one million, six hundred eighty-nine thousand, four hundred forty-nine".