1989831873 has 8 divisors (see below), whose sum is σ = 2655790336. Its totient is φ = 1325214000.

The previous prime is 1989831869. The next prime is 1989831889. The reversal of 1989831873 is 3781389891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1989831873 - 2² = 1989831869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989831673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331678 + ... + 337623.

It is an arithmetic number, because the mean of its divisors is an integer number (331973792).

Almost surely, 2^1989831873 is an apocalyptic number.

It is an amenable number.

1989831873 is a deficient number, since it is larger than the sum of its proper divisors (665958463).

1989831873 is an equidigital number, since it uses as much as digits as its factorization.

1989831873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670295.

The product of its digits is 2612736, while the sum is 57.

The square root of 1989831873 is about 44607.5315725943. The cubic root of 1989831873 is about 1257.7822483142.

The spelling of 1989831873 in words is "one billion, nine hundred eighty-nine million, eight hundred thirty-one thousand, eight hundred seventy-three".