199995870 has 32 divisors (see below), whose sum is σ = 480403872. Its totient is φ = 53286272.

The previous prime is 199995869. The next prime is 199995877. The reversal of 199995870 is 78599991.

It is a self number, because there is not a number n which added to its sum of digits gives 199995870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199995877) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 46324 + ... + 50456.

It is an arithmetic number, because the mean of its divisors is an integer number (15012621).

Almost surely, 2^199995870 is an apocalyptic number.

199995870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199995870 is an abundant number, since it is smaller than the sum of its proper divisors (280408002).

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

199995870 is a wasteful number, since it uses less digits than its factorization.

199995870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5756.

The product of its (nonzero) digits is 1837080, while the sum is 57.

The square root of 199995870 is about 14141.9896054268. The cubic root of 199995870 is about 584.7995222171.

The spelling of 199995870 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, eight hundred seventy".