1020189 has 4 divisors (see below), whose sum is σ = 1360256. Its totient is φ = 680124.

The previous prime is 1020163. The next prime is 1020223. The reversal of 1020189 is 9810201.

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.

It is not a de Polignac number, because 1020189 - 2⁵ = 1020157 is a prime.

It is a D-number.

It is a Duffinian number.

1020189 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020109) 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, 170029 + ... + 170034.

It is an arithmetic number, because the mean of its divisors is an integer number (340064).

2^1020189 is an apocalyptic number.

It is an amenable number.

1020189 is a deficient number, since it is larger than the sum of its proper divisors (340067).

1020189 is an equidigital number, since it uses as much as digits as its factorization.

1020189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340066.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1020189 is about 1010.0440584450. The cubic root of 1020189 is about 100.6684879476.

The spelling of 1020189 in words is "one million, twenty thousand, one hundred eighty-nine".