1898381899 has 2 divisors, whose sum is σ = 1898381900. Its totient is φ = 1898381898.

The previous prime is 1898381897. The next prime is 1898381911. The reversal of 1898381899 is 9981838981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1898381899 - 2¹ = 1898381897 is a prime.

Together with 1898381897, 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 1898381899.

It is not a weakly prime, because it can be changed into another prime (1898381897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949190949 + 949190950.

It is an arithmetic number, because the mean of its divisors is an integer number (949190950).

Almost surely, 2^1898381899 is an apocalyptic number.

1898381899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898381899 is an equidigital number, since it uses as much as digits as its factorization.

1898381899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 64.

The square root of 1898381899 is about 43570.4245905408. The cubic root of 1898381899 is about 1238.2106299569.

The spelling of 1898381899 in words is "one billion, eight hundred ninety-eight million, three hundred eighty-one thousand, eight hundred ninety-nine".