1690189 has 2 divisors, whose sum is σ = 1690190. Its totient is φ = 1690188.

The previous prime is 1690187. The next prime is 1690193. The reversal of 1690189 is 9810961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1646089 + 44100 = 1283^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690189 - 2¹ = 1690187 is a prime.

Together with 1690187, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

1690189 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1690187) 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 as a sum of consecutive naturals, namely, 845094 + 845095.

It is an arithmetic number, because the mean of its divisors is an integer number (845095).

2^1690189 is an apocalyptic number.

It is an amenable number.

1690189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690189 is an equidigital number, since it uses as much as digits as its factorization.

1690189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1690189 is about 1300.0726902754. The cubic root of 1690189 is about 119.1182826926.

The spelling of 1690189 in words is "one million, six hundred ninety thousand, one hundred eighty-nine".