199997775 has 96 divisors (see below), whose sum is σ = 403099200. Its totient is φ = 96768000.

The previous prime is 199997767. The next prime is 199997797. The reversal of 199997775 is 577799991.

It is not a de Polignac number, because 199997775 - 2³ = 199997767 is a prime.

It is a super-2 number, since 2×199997775² = 79998220009901250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 332475 + ... + 333075.

It is an arithmetic number, because the mean of its divisors is an integer number (4198950).

Almost surely, 2^199997775 is an apocalyptic number.

199997775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

199997775 is an abundant number, since it is smaller than the sum of its proper divisors (203101425).

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

199997775 is a wasteful number, since it uses less digits than its factorization.

199997775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 655 counting only the distinct ones).

The product of its digits is 11252115, while the sum is 63.

The square root of 199997775 is about 14142.0569578828. The cubic root of 199997775 is about 584.8013789880.

The spelling of 199997775 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred seventy-five".