1689123 has 4 divisors (see below), whose sum is σ = 2252168. Its totient is φ = 1126080.

The previous prime is 1689113. The next prime is 1689167. The reversal of 1689123 is 3219861.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1689123 is a prime.

It is a D-number.

It is a Duffinian number.

1689123 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1689113) 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, 281518 + ... + 281523.

It is an arithmetic number, because the mean of its divisors is an integer number (563042).

2^1689123 is an apocalyptic number.

1689123 is a deficient number, since it is larger than the sum of its proper divisors (563045).

1689123 is an equidigital number, since it uses as much as digits as its factorization.

1689123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563044.

The product of its digits is 2592, while the sum is 30.

The square root of 1689123 is about 1299.6626485361. The cubic root of 1689123 is about 119.0932348441.

The spelling of 1689123 in words is "one million, six hundred eighty-nine thousand, one hundred twenty-three".