199979634 has 8 divisors (see below), whose sum is σ = 399959280. Its totient is φ = 66659876.

The previous prime is 199979629. The next prime is 199979651. The reversal of 199979634 is 436979991.

It is a sphenic number, since it is the product of 3 distinct primes.

199979634 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 16664964 + ... + 16664975.

It is an arithmetic number, because the mean of its divisors is an integer number (49994910).

Almost surely, 2^199979634 is an apocalyptic number.

199979634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

199979634 is a wasteful number, since it uses less digits than its factorization.

199979634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33329944.

The product of its digits is 3306744, while the sum is 57.

The square root of 199979634 is about 14141.4155585641. The cubic root of 199979634 is about 584.7836967870.

The spelling of 199979634 in words is "one hundred ninety-nine million, nine hundred seventy-nine thousand, six hundred thirty-four".