199947855 has 32 divisors (see below), whose sum is σ = 335301120. Its totient is φ = 101552000.

The previous prime is 199947841. The next prime is 199947871. The reversal of 199947855 is 558749991.

It is not a de Polignac number, because 199947855 - 2⁶ = 199947791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199947795 and 199947804.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 85441 + ... + 87749.

It is an arithmetic number, because the mean of its divisors is an integer number (10478160).

Almost surely, 2^199947855 is an apocalyptic number.

199947855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

199947855 is a deficient number, since it is larger than the sum of its proper divisors (135353265).

199947855 is a wasteful number, since it uses less digits than its factorization.

199947855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591.

The product of its digits is 4082400, while the sum is 57.

The square root of 199947855 is about 14140.2918993916. The cubic root of 199947855 is about 584.7527189232.

The spelling of 199947855 in words is "one hundred ninety-nine million, nine hundred forty-seven thousand, eight hundred fifty-five".