1989478485 has 24 divisors (see below), whose sum is σ = 3451738680. Its totient is φ = 1060036992.

The previous prime is 1989478483. The next prime is 1989478501. The reversal of 1989478485 is 5848749891.

1989478485 is a `hidden beast` number, since 1 + 9 + 89 + 4 + 78 + 485 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 292615236 + 1696863249 = 17106^2 + 41193^2 .

It is not a de Polignac number, because 1989478485 - 2¹ = 1989478483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989478483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27427 + ... + 68783.

It is an arithmetic number, because the mean of its divisors is an integer number (143822445).

Almost surely, 2^1989478485 is an apocalyptic number.

1989478485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1989478485 is a deficient number, since it is larger than the sum of its proper divisors (1462260195).

1989478485 is a wasteful number, since it uses less digits than its factorization.

1989478485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42437 (or 42434 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The square root of 1989478485 is about 44603.5703167359. The cubic root of 1989478485 is about 1257.7077844905.

The spelling of 1989478485 in words is "one billion, nine hundred eighty-nine million, four hundred seventy-eight thousand, four hundred eighty-five".