199999956 has 24 divisors (see below), whose sum is σ = 502564384. Its totient is φ = 61538400.

The previous prime is 199999949. The next prime is 199999957. The reversal of 199999956 is 659999991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640870 + ... + 641181.

Almost surely, 2^199999956 is an apocalyptic number.

It is an amenable number.

199999956 is an abundant number, since it is smaller than the sum of its proper divisors (302564428).

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

199999956 is a wasteful number, since it uses less digits than its factorization.

199999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282071 (or 1282069 counting only the distinct ones).

The product of its digits is 15943230, while the sum is 66.

The square root of 199999956 is about 14142.1340680959. The cubic root of 199999956 is about 584.8035047570.

The spelling of 199999956 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-six".