1989333485 has 4 divisors (see below), whose sum is σ = 2387200188. Its totient is φ = 1591466784.

The previous prime is 1989333481. The next prime is 1989333491. The reversal of 1989333485 is 5843339891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5843339891 = 29 ⋅201494479.

It can be written as a sum of positive squares in 2 ways, for example, as 1458399721 + 530933764 = 38189^2 + 23042^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989333485 - 2² = 1989333481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989333481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198933344 + ... + 198933353.

It is an arithmetic number, because the mean of its divisors is an integer number (596800047).

Almost surely, 2^1989333485 is an apocalyptic number.

It is an amenable number.

1989333485 is a deficient number, since it is larger than the sum of its proper divisors (397866703).

1989333485 is an equidigital number, since it uses as much as digits as its factorization.

1989333485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397866702.

The product of its digits is 2799360, while the sum is 53.

The square root of 1989333485 is about 44601.9448566988. The cubic root of 1989333485 is about 1257.6772283991.

The spelling of 1989333485 in words is "one billion, nine hundred eighty-nine million, three hundred thirty-three thousand, four hundred eighty-five".