199643775 has 12 divisors (see below), whose sum is σ = 330077832. Its totient is φ = 106476640.

The previous prime is 199643761. The next prime is 199643777. The reversal of 199643775 is 577346991.

It is not a de Polignac number, because 199643775 - 2¹⁵ = 199611007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199643777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1330884 + ... + 1331033.

It is an arithmetic number, because the mean of its divisors is an integer number (27506486).

Almost surely, 2^199643775 is an apocalyptic number.

199643775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

199643775 is a deficient number, since it is larger than the sum of its proper divisors (130434057).

199643775 is a wasteful number, since it uses less digits than its factorization.

199643775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661930 (or 2661925 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 51.

The square root of 199643775 is about 14129.5355549997. The cubic root of 199643775 is about 584.4561385616.

The spelling of 199643775 in words is "one hundred ninety-nine million, six hundred forty-three thousand, seven hundred seventy-five".