1989144895 has 8 divisors (see below), whose sum is σ = 2402782560. Its totient is φ = 1580776800.

The previous prime is 1989144881. The next prime is 1989144907. The reversal of 1989144895 is 5984419891.

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

It is not a de Polignac number, because 1989144895 - 2⁵ = 1989144863 is a prime.

It is a super-3 number, since 3×1989144895³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316560 + ... + 1318069.

It is an arithmetic number, because the mean of its divisors is an integer number (300347820).

Almost surely, 2^1989144895 is an apocalyptic number.

1989144895 is a deficient number, since it is larger than the sum of its proper divisors (413637665).

1989144895 is a wasteful number, since it uses less digits than its factorization.

1989144895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634785.

The product of its digits is 3732480, while the sum is 58.

The square root of 1989144895 is about 44599.8306611135. The cubic root of 1989144895 is about 1257.6374842929.

The spelling of 1989144895 in words is "one billion, nine hundred eighty-nine million, one hundred forty-four thousand, eight hundred ninety-five".