1689523 has 6 divisors (see below), whose sum is σ = 1857212. Its totient is φ = 1535820.

The previous prime is 1689521. The next prime is 1689533. The reversal of 1689523 is 3259861.

It is not a de Polignac number, because 1689523 - 2¹ = 1689521 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1689521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6861 + ... + 7102.

2^1689523 is an apocalyptic number.

1689523 is a deficient number, since it is larger than the sum of its proper divisors (167689).

1689523 is a wasteful number, since it uses less digits than its factorization.

1689523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13985 (or 13974 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 1689523 is about 1299.8165255143. The cubic root of 1689523 is about 119.1026348965.

The spelling of 1689523 in words is "one million, six hundred eighty-nine thousand, five hundred twenty-three".