1998169508 has 12 divisors (see below), whose sum is σ = 3527742540. Its totient is φ = 990243072.

The previous prime is 1998169507. The next prime is 1998169559. The reversal of 1998169508 is 8059618991.

It can be written as a sum of positive squares in 2 ways, for example, as 439657024 + 1558512484 = 20968^2 + 39478^2 .

It is not an unprimeable number, because it can be changed into a prime (1998169501) 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, 2209913 + ... + 2210816.

It is an arithmetic number, because the mean of its divisors is an integer number (293978545).

Almost surely, 2^1998169508 is an apocalyptic number.

It is an amenable number.

1998169508 is a deficient number, since it is larger than the sum of its proper divisors (1529573032).

1998169508 is a wasteful number, since it uses less digits than its factorization.

1998169508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4420846 (or 4420844 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 56.

The square root of 1998169508 is about 44700.8893423833. The cubic root of 1998169508 is about 1259.5365533343.

The spelling of 1998169508 in words is "one billion, nine hundred ninety-eight million, one hundred sixty-nine thousand, five hundred eight".