1989816498 has 24 divisors (see below), whose sum is σ = 4459934700. Its totient is φ = 640400544.

The previous prime is 1989816467. The next prime is 1989816533. The reversal of 1989816498 is 8946189891.

It can be written as a sum of positive squares in 2 ways, for example, as 1749163329 + 240653169 = 41823^2 + 15513^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1905433 + ... + 1906476.

Almost surely, 2^1989816498 is an apocalyptic number.

1989816498 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1989816498 is an abundant number, since it is smaller than the sum of its proper divisors (2470118202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989816498 is a wasteful number, since it uses less digits than its factorization.

1989816498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3811946 (or 3811943 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 63.

The square root of 1989816498 is about 44607.3592358929. The cubic root of 1989816498 is about 1257.7790087688.

The spelling of 1989816498 in words is "one billion, nine hundred eighty-nine million, eight hundred sixteen thousand, four hundred ninety-eight".