1689139 has 4 divisors (see below), whose sum is σ = 1693224. Its totient is φ = 1685056.

The previous prime is 1689113. The next prime is 1689167. The reversal of 1689139 is 9319861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9319861 = 19 ⋅490519.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1689139 is a prime.

It is a super-2 number, since 2×1689139² = 5706381122642, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1689098 and 1689107.

It is not an unprimeable number, because it can be changed into a prime (1689109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1342 + ... + 2275.

It is an arithmetic number, because the mean of its divisors is an integer number (423306).

2^1689139 is an apocalyptic number.

1689139 is a deficient number, since it is larger than the sum of its proper divisors (4085).

1689139 is an equidigital number, since it uses as much as digits as its factorization.

1689139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4084.

The product of its digits is 11664, while the sum is 37.

The square root of 1689139 is about 1299.6688039651. The cubic root of 1689139 is about 119.0936108747.

The spelling of 1689139 in words is "one million, six hundred eighty-nine thousand, one hundred thirty-nine".