199980816 has 40 divisors (see below), whose sum is σ = 590420544. Its totient is φ = 57137280.

The previous prime is 199980811. The next prime is 199980841. The reversal of 199980816 is 618089991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (199980811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297255 + ... + 297926.

Almost surely, 2^199980816 is an apocalyptic number.

199980816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

199980816 is an abundant number, since it is smaller than the sum of its proper divisors (390439728).

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

199980816 is a wasteful number, since it uses less digits than its factorization.

199980816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595199 (or 595193 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 199980816 is about 14141.4573506411. The cubic root of 199980816 is about 584.7848489259.

The spelling of 199980816 in words is "one hundred ninety-nine million, nine hundred eighty thousand, eight hundred sixteen".