1998515 has 16 divisors (see below), whose sum is σ = 2560800. Its totient is φ = 1492992.

The previous prime is 1998497. The next prime is 1998517. The reversal of 1998515 is 5158991.

It is a cyclic number.

It is not a de Polignac number, because 1998515 - 2²⁰ = 949939 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1998517) 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, 10259 + ... + 10451.

It is an arithmetic number, because the mean of its divisors is an integer number (160050).

2^1998515 is an apocalyptic number.

1998515 is a deficient number, since it is larger than the sum of its proper divisors (562285).

1998515 is a wasteful number, since it uses less digits than its factorization.

1998515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326.

The product of its digits is 16200, while the sum is 38.

The square root of 1998515 is about 1413.6884380938. The cubic root of 1998515 is about 125.9609142225.

The spelling of 1998515 in words is "one million, nine hundred ninety-eight thousand, five hundred fifteen".