1689937 has 4 divisors (see below), whose sum is σ = 1718640. Its totient is φ = 1661236.

The previous prime is 1689931. The next prime is 1689967. The reversal of 1689937 is 7399861.

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 1689937 - 2³ = 1689929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1689893 and 1689902.

It is not an unprimeable number, because it can be changed into a prime (1689931) 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, 14263 + ... + 14380.

It is an arithmetic number, because the mean of its divisors is an integer number (429660).

2^1689937 is an apocalyptic number.

It is an amenable number.

1689937 is a deficient number, since it is larger than the sum of its proper divisors (28703).

1689937 is an equidigital number, since it uses as much as digits as its factorization.

1689937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28702.

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

The square root of 1689937 is about 1299.9757690049. The cubic root of 1689937 is about 119.1123623884.

The spelling of 1689937 in words is "one million, six hundred eighty-nine thousand, nine hundred thirty-seven".