1689349 has 4 divisors (see below), whose sum is σ = 1692064. Its totient is φ = 1686636.

The previous prime is 1689343. The next prime is 1689353. The reversal of 1689349 is 9439861.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9439861 = 107 ⋅88223.

It is a cyclic number.

It is not a de Polignac number, because 1689349 - 2⁹ = 1688837 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689343) 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, 94 + ... + 1840.

It is an arithmetic number, because the mean of its divisors is an integer number (423016).

2^1689349 is an apocalyptic number.

It is an amenable number.

1689349 is a deficient number, since it is larger than the sum of its proper divisors (2715).

1689349 is an equidigital number, since it uses as much as digits as its factorization.

1689349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714.

The product of its digits is 46656, while the sum is 40.

The square root of 1689349 is about 1299.7495912675. The cubic root of 1689349 is about 119.0985460561.

The spelling of 1689349 in words is "one million, six hundred eighty-nine thousand, three hundred forty-nine".