199999984 has 10 divisors (see below), whose sum is σ = 387500000. Its totient is φ = 99999984.

The previous prime is 199999963. The next prime is 199999991. The reversal of 199999984 is 489999991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6249984 + ... + 6250015.

It is an arithmetic number, because the mean of its divisors is an integer number (38750000).

Almost surely, 2^199999984 is an apocalyptic number.

It is an amenable number.

199999984 is a deficient number, since it is larger than the sum of its proper divisors (187500016).

199999984 is a wasteful number, since it uses less digits than its factorization.

199999984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500007 (or 12500001 counting only the distinct ones).

The product of its digits is 17006112, while the sum is 67.

The square root of 199999984 is about 14142.1350580455. The cubic root of 199999984 is about 584.8035320478.

It can be divided in two parts, 19999998 and 4, that added together give a palindrome (20000002).

The spelling of 199999984 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-four".