1689361 has 4 divisors (see below), whose sum is σ = 1692900. Its totient is φ = 1685824.

The previous prime is 1689353. The next prime is 1689367. The reversal of 1689361 is 1639861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101761 + 1587600 = 319^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689361 - 2³ = 1689353 is a prime.

It is a Duffinian number.

1689361 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1689367) 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, 916 + ... + 2053.

It is an arithmetic number, because the mean of its divisors is an integer number (423225).

2^1689361 is an apocalyptic number.

It is an amenable number.

1689361 is a deficient number, since it is larger than the sum of its proper divisors (3539).

1689361 is an equidigital number, since it uses as much as digits as its factorization.

1689361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538.

The product of its digits is 7776, while the sum is 34.

The square root of 1689361 is about 1299.7542075331. The cubic root of 1689361 is about 119.0988280541.

The spelling of 1689361 in words is "one million, six hundred eighty-nine thousand, three hundred sixty-one".