1998115 has 8 divisors (see below), whose sum is σ = 2740320. Its totient is φ = 1370112.

The previous prime is 1998109. The next prime is 1998119. The reversal of 1998115 is 5118991.

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

It is a cyclic number.

It is not a de Polignac number, because 1998115 - 2³ = 1998107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1998119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28510 + ... + 28579.

It is an arithmetic number, because the mean of its divisors is an integer number (342540).

2^1998115 is an apocalyptic number.

1998115 is a deficient number, since it is larger than the sum of its proper divisors (742205).

1998115 is an equidigital number, since it uses as much as digits as its factorization.

1998115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57101.

The product of its digits is 3240, while the sum is 34.

The square root of 1998115 is about 1413.5469571259. The cubic root of 1998115 is about 125.9525100278.

The spelling of 1998115 in words is "one million, nine hundred ninety-eight thousand, one hundred fifteen".