199981347 has 8 divisors (see below), whose sum is σ = 272842944. Its totient is φ = 130220328.

The previous prime is 199981333. The next prime is 199981351. The reversal of 199981347 is 743189991.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-199981347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199981347.

It is not an unprimeable number, because it can be changed into a prime (199981357) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 774993 + ... + 775250.

It is an arithmetic number, because the mean of its divisors is an integer number (34105368).

Almost surely, 2^199981347 is an apocalyptic number.

199981347 is a deficient number, since it is larger than the sum of its proper divisors (72861597).

199981347 is a wasteful number, since it uses less digits than its factorization.

199981347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550289.

The product of its digits is 489888, while the sum is 51.

The square root of 199981347 is about 14141.4761252141. The cubic root of 199981347 is about 584.7853665097.

The spelling of 199981347 in words is "one hundred ninety-nine million, nine hundred eighty-one thousand, three hundred forty-seven".