199918550 has 72 divisors (see below), whose sum is σ = 410498280. Its totient is φ = 72384000.

The previous prime is 199918549. The next prime is 199918559. The reversal of 199918550 is 55819991.

It is a junction number, because it is equal to n+sod(n) for n = 199918495 and 199918504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199918559) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 498350 + ... + 498750.

It is an arithmetic number, because the mean of its divisors is an integer number (5701365).

Almost surely, 2^199918550 is an apocalyptic number.

199918550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199918550 is an abundant number, since it is smaller than the sum of its proper divisors (210579730).

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

199918550 is a wasteful number, since it uses less digits than its factorization.

199918550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 47.

The square root of 199918550 is about 14139.2556381162. The cubic root of 199918550 is about 584.7241497817.

The spelling of 199918550 in words is "one hundred ninety-nine million, nine hundred eighteen thousand, five hundred fifty".