1998513 has 20 divisors (see below), whose sum is σ = 3258288. Its totient is φ = 1210680.

The previous prime is 1998497. The next prime is 1998517. The reversal of 1998513 is 3158991.

It is a happy number.

It is not a de Polignac number, because 1998513 - 2⁴ = 1998497 is a prime.

It is a super-2 number, since 2×1998513² = 7988108422338, which contains 22 as substring.

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 19 ways as a sum of consecutive naturals, for example, 231 + ... + 2012.

2^1998513 is an apocalyptic number.

It is an amenable number.

1998513 is a deficient number, since it is larger than the sum of its proper divisors (1259775).

1998513 is a wasteful number, since it uses less digits than its factorization.

1998513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266 (or 2257 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1998513 is about 1413.6877307242. The cubic root of 1998513 is about 125.9608722043.

The spelling of 1998513 in words is "one million, nine hundred ninety-eight thousand, five hundred thirteen".