1979189 has 2 divisors, whose sum is σ = 1979190. Its totient is φ = 1979188.

The previous prime is 1979183. The next prime is 1979207. The reversal of 1979189 is 9819791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1932100 + 47089 = 1390^2 + 217^2 .

It is an emirp because it is prime and its reverse (9819791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1979183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989594 + 989595.

It is an arithmetic number, because the mean of its divisors is an integer number (989595).

2^1979189 is an apocalyptic number.

It is an amenable number.

1979189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979189 is an equidigital number, since it uses as much as digits as its factorization.

1979189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 44.

The square root of 1979189 is about 1406.8365221304. The cubic root of 1979189 is about 125.5535768028.

The spelling of 1979189 in words is "one million, nine hundred seventy-nine thousand, one hundred eighty-nine".