1838656489 has 2 divisors, whose sum is σ = 1838656490. Its totient is φ = 1838656488.

The previous prime is 1838656481. The next prime is 1838656499. The reversal of 1838656489 is 9846568381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1018120464 + 820536025 = 31908^2 + 28645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1838656489 - 2³ = 1838656481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1838656481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919328244 + 919328245.

It is an arithmetic number, because the mean of its divisors is an integer number (919328245).

Almost surely, 2^1838656489 is an apocalyptic number.

It is an amenable number.

1838656489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1838656489 is an equidigital number, since it uses as much as digits as its factorization.

1838656489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 58.

The square root of 1838656489 is about 42879.5579384863. The cubic root of 1838656489 is about 1225.0868163378.

The spelling of 1838656489 in words is "one billion, eight hundred thirty-eight million, six hundred fifty-six thousand, four hundred eighty-nine".