199999964 has 6 divisors (see below), whose sum is σ = 349999944. Its totient is φ = 99999980.

The previous prime is 199999963. The next prime is 199999991. The reversal of 199999964 is 469999991.

It is a self number, because there is not a number n which added to its sum of digits gives 199999964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999992 + ... + 24999999.

It is an arithmetic number, because the mean of its divisors is an integer number (58333324).

Almost surely, 2^199999964 is an apocalyptic number.

It is an amenable number.

199999964 is a deficient number, since it is larger than the sum of its proper divisors (149999980).

199999964 is a wasteful number, since it uses less digits than its factorization.

199999964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49999995 (or 49999993 counting only the distinct ones).

The product of its digits is 12754584, while the sum is 65.

The square root of 199999964 is about 14142.1343509387. The cubic root of 199999964 is about 584.8035125544.

The spelling of 199999964 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-four".