1798437889 has 2 divisors, whose sum is σ = 1798437890. Its totient is φ = 1798437888.

The previous prime is 1798437887. The next prime is 1798437911. The reversal of 1798437889 is 9887348971.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1794369600 + 4068289 = 42360^2 + 2017^2 .

It is a cyclic number.

It is not a de Polignac number, because 1798437889 - 2¹ = 1798437887 is a prime.

Together with 1798437887, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1798437889.

It is not a weakly prime, because it can be changed into another prime (1798437887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899218944 + 899218945.

It is an arithmetic number, because the mean of its divisors is an integer number (899218945).

Almost surely, 2^1798437889 is an apocalyptic number.

It is an amenable number.

1798437889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798437889 is an equidigital number, since it uses as much as digits as its factorization.

1798437889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24385536, while the sum is 64.

The square root of 1798437889 is about 42407.9932206182. The cubic root of 1798437889 is about 1216.0884056170.

The spelling of 1798437889 in words is "one billion, seven hundred ninety-eight million, four hundred thirty-seven thousand, eight hundred eighty-nine".