1689559 has 4 divisors (see below), whose sum is σ = 1692160. Its totient is φ = 1686960.

The previous prime is 1689553. The next prime is 1689601. The reversal of 1689559 is 9559861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9559861 = 73 ⋅130957.

It is a cyclic number.

It is not a de Polignac number, because 1689559 - 2³ = 1689551 is a prime.

It is a super-2 number, since 2×1689559² = 5709219228962, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689551) 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, 619 + ... + 1939.

It is an arithmetic number, because the mean of its divisors is an integer number (423040).

2^1689559 is an apocalyptic number.

1689559 is a deficient number, since it is larger than the sum of its proper divisors (2601).

1689559 is a wasteful number, since it uses less digits than its factorization.

1689559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600.

The product of its digits is 97200, while the sum is 43.

The square root of 1689559 is about 1299.8303735488. The cubic root of 1689559 is about 119.1034808285.

The spelling of 1689559 in words is "one million, six hundred eighty-nine thousand, five hundred fifty-nine".