199891080 has 48 divisors (see below), whose sum is σ = 649647180. Its totient is φ = 53304192.

The previous prime is 199891079. The next prime is 199891103. The reversal of 199891080 is 80198991.

It can be written as a sum of positive squares in 2 ways, for example, as 193265604 + 6625476 = 13902^2 + 2574^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277267 + ... + 277986.

Almost surely, 2^199891080 is an apocalyptic number.

199891080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199891080 is an abundant number, since it is smaller than the sum of its proper divisors (449756100).

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

199891080 is a wasteful number, since it uses less digits than its factorization.

199891080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555270 (or 555263 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 199891080 is about 14138.2841957573. The cubic root of 199891080 is about 584.6973670276.

The spelling of 199891080 in words is "one hundred ninety-nine million, eight hundred ninety-one thousand, eighty".