1689899 has 4 divisors (see below), whose sum is σ = 1698120. Its totient is φ = 1681680.

The previous prime is 1689893. The next prime is 1689907. The reversal of 1689899 is 9989861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1689899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689893) 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, 3794 + ... + 4215.

It is an arithmetic number, because the mean of its divisors is an integer number (424530).

2^1689899 is an apocalyptic number.

1689899 is a deficient number, since it is larger than the sum of its proper divisors (8221).

1689899 is an equidigital number, since it uses as much as digits as its factorization.

1689899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8220.

The product of its digits is 279936, while the sum is 50.

The square root of 1689899 is about 1299.9611532657. The cubic root of 1689899 is about 119.1114695931. Note that the first 3 decimals are identical.

The spelling of 1689899 in words is "one million, six hundred eighty-nine thousand, eight hundred ninety-nine".