199988770 has 8 divisors (see below), whose sum is σ = 359979804. Its totient is φ = 79995504.

The previous prime is 199988759. The next prime is 199988771. The reversal of 199988770 is 77889991.

It can be written as a sum of positive squares in 2 ways, for example, as 185858689 + 14130081 = 13633^2 + 3759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×199988770² = 79991016252225800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199988771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9999429 + ... + 9999448.

Almost surely, 2^199988770 is an apocalyptic number.

199988770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199988770 is a deficient number, since it is larger than the sum of its proper divisors (159991034).

199988770 is a wasteful number, since it uses less digits than its factorization.

199988770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19998884.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The square root of 199988770 is about 14141.7385776997. The cubic root of 199988770 is about 584.7926018646.

The spelling of 199988770 in words is "one hundred ninety-nine million, nine hundred eighty-eight thousand, seven hundred seventy".