1898380489 has 4 divisors (see below), whose sum is σ = 1898470656. Its totient is φ = 1898290324.

The previous prime is 1898380487. The next prime is 1898380493. The reversal of 1898380489 is 9840838981.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9840838981 = 49307 ⋅199583.

It is a cyclic number.

It is not a de Polignac number, because 1898380489 - 2¹ = 1898380487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1898380487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5172 + ... + 61834.

It is an arithmetic number, because the mean of its divisors is an integer number (474617664).

Almost surely, 2^1898380489 is an apocalyptic number.

It is an amenable number.

1898380489 is a deficient number, since it is larger than the sum of its proper divisors (90167).

1898380489 is an equidigital number, since it uses as much as digits as its factorization.

1898380489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90166.

The product of its (nonzero) digits is 3981312, while the sum is 58.

The square root of 1898380489 is about 43570.4084098371. The cubic root of 1898380489 is about 1238.2103234016.

The spelling of 1898380489 in words is "one billion, eight hundred ninety-eight million, three hundred eighty thousand, four hundred eighty-nine".