199998520 has 16 divisors (see below), whose sum is σ = 449996760. Its totient is φ = 79999392.

The previous prime is 199998517. The next prime is 199998559. The reversal of 199998520 is 25899991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2499942 + ... + 2500021.

Almost surely, 2^199998520 is an apocalyptic number.

199998520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199998520 is an abundant number, since it is smaller than the sum of its proper divisors (249998240).

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

199998520 is a wasteful number, since it uses less digits than its factorization.

199998520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4999974 (or 4999970 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 52.

The square root of 199998520 is about 14142.0832977323. The cubic root of 199998520 is about 584.8021051236.

The spelling of 199998520 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred twenty".