1998857118 has 32 divisors (see below), whose sum is σ = 4032746496. Its totient is φ = 660467808.

The previous prime is 1998857117. The next prime is 1998857143. The reversal of 1998857118 is 8117588991.

1998857118 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998857117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433855 + ... + 438437.

It is an arithmetic number, because the mean of its divisors is an integer number (126023328).

Almost surely, 2^1998857118 is an apocalyptic number.

1998857118 is an abundant number, since it is smaller than the sum of its proper divisors (2033889378).

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

1998857118 is a wasteful number, since it uses less digits than its factorization.

1998857118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5208.

The product of its digits is 1451520, while the sum is 57.

The square root of 1998857118 is about 44708.5799148217. The cubic root of 1998857118 is about 1259.6810139854.

The spelling of 1998857118 in words is "one billion, nine hundred ninety-eight million, eight hundred fifty-seven thousand, one hundred eighteen".