1689973 has 4 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 1686508.

The previous prime is 1689967. The next prime is 1690009. The reversal of 1689973 is 3799861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1689973 - 2¹⁷ = 1558901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689913) 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, 853 + ... + 2026.

It is an arithmetic number, because the mean of its divisors is an integer number (423360).

2^1689973 is an apocalyptic number.

It is an amenable number.

1689973 is a deficient number, since it is larger than the sum of its proper divisors (3467).

1689973 is an equidigital number, since it uses as much as digits as its factorization.

1689973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466.

The product of its digits is 81648, while the sum is 43.

The square root of 1689973 is about 1299.9896153431. The cubic root of 1689973 is about 119.1132081822.

It can be divided in two parts, 1689 and 973, that added together give a palindrome (2662).

The spelling of 1689973 in words is "one million, six hundred eighty-nine thousand, nine hundred seventy-three".